3r+7r-(-11r)-10r+-12r=20

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Solution for 3r+7r-(-11r)-10r+-12r=20 equation: 


Simplifying
3r + 7r + -1(-11r) + -10r + -12r = 20

Remove parenthesis around (-11r)
3r + 7r + -1 * -11r + -10r + -12r = 20

Multiply -1 * -11
3r + 7r + 11r + -10r + -12r = 20

Combine like terms: 3r + 7r = 10r
10r + 11r + -10r + -12r = 20

Combine like terms: 10r + 11r = 21r
21r + -10r + -12r = 20

Combine like terms: 21r + -10r = 11r
11r + -12r = 20

Combine like terms: 11r + -12r = -1r
-1r = 20

Solving
-1r = 20

Solving for variable 'r'.

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

Divide each side by '-1'.
r = -20

Simplifying
r = -20

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