r-(-8)=12

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Solution for r-(-8)=12 equation: 


Simplifying
r + -1(-8) = 12

Multiply -1 * -8
r + 8 = 12

Reorder the terms:
8 + r = 12

Solving
8 + r = 12

Solving for variable 'r'.

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

Add '-8' to each side of the equation.
8 + -8 + r = 12 + -8

Combine like terms: 8 + -8 = 0
0 + r = 12 + -8
r = 12 + -8

Combine like terms: 12 + -8 = 4
r = 4

Simplifying
r = 4

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