1+1-2+3-4+5-6+7-8+9-10+11-12+13-14+15-16+17-18+19-20=

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Solution for 1+1-2+3-4+5-6+7-8+9-10+11-12+13-14+15-16+17-18+19-20= equation: 


Simplifying
1 + 1 + -2 + 3 + -4 + 5 + -6 + 7 + -8 + 9 + -10 + 11 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: 1 + 1 = 2
2 + -2 + 3 + -4 + 5 + -6 + 7 + -8 + 9 + -10 + 11 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: 2 + -2 = 0
0 + 3 + -4 + 5 + -6 + 7 + -8 + 9 + -10 + 11 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0
3 + -4 + 5 + -6 + 7 + -8 + 9 + -10 + 11 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: 3 + -4 = -1
-1 + 5 + -6 + 7 + -8 + 9 + -10 + 11 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: -1 + 5 = 4
4 + -6 + 7 + -8 + 9 + -10 + 11 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: 4 + -6 = -2
-2 + 7 + -8 + 9 + -10 + 11 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: -2 + 7 = 5
5 + -8 + 9 + -10 + 11 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: 5 + -8 = -3
-3 + 9 + -10 + 11 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: -3 + 9 = 6
6 + -10 + 11 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: 6 + -10 = -4
-4 + 11 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: -4 + 11 = 7
7 + -12 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: 7 + -12 = -5
-5 + 13 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: -5 + 13 = 8
8 + -14 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: 8 + -14 = -6
-6 + 15 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: -6 + 15 = 9
9 + -16 + 17 + -18 + 19 + -20 = 0

Combine like terms: 9 + -16 = -7
-7 + 17 + -18 + 19 + -20 = 0

Combine like terms: -7 + 17 = 10
10 + -18 + 19 + -20 = 0

Combine like terms: 10 + -18 = -8
-8 + 19 + -20 = 0

Combine like terms: -8 + 19 = 11
11 + -20 = 0

Combine like terms: 11 + -20 = -9
-9 = 0

Solving
-9 = 0

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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