3x+9-4x+1=20

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Solution for 3x+9-4x+1=20 equation: 


Simplifying
3x + 9 + -4x + 1 = 20

Reorder the terms:
9 + 1 + 3x + -4x = 20

Combine like terms: 9 + 1 = 10
10 + 3x + -4x = 20

Combine like terms: 3x + -4x = -1x
10 + -1x = 20

Solving
10 + -1x = 20

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-10' to each side of the equation.
10 + -10 + -1x = 20 + -10

Combine like terms: 10 + -10 = 0
0 + -1x = 20 + -10
-1x = 20 + -10

Combine like terms: 20 + -10 = 10
-1x = 10

Divide each side by '-1'.
x = -10

Simplifying
x = -10

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