10=20-r

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Solution for 10=20-r equation:


Simplifying
10 = 20 + -1r

Solving
10 = 20 + -1r

Solving for variable 'r'.

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

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

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

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

Combine like terms: 10 + -10 = 0
0 + r = 20 + -10
r = 20 + -10

Combine like terms: 20 + -10 = 10
r = 10

Simplifying
r = 10

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