r-(-17)=12

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Solution for r-(-17)=12 equation: 


Simplifying
r + -1(-17) = 12

Multiply -1 * -17
r + 17 = 12

Reorder the terms:
17 + r = 12

Solving
17 + r = 12

Solving for variable 'r'.

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

Add '-17' to each side of the equation.
17 + -17 + r = 12 + -17

Combine like terms: 17 + -17 = 0
0 + r = 12 + -17
r = 12 + -17

Combine like terms: 12 + -17 = -5
r = -5

Simplifying
r = -5

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