-3-r=12

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Solution for -3-r=12 equation: 


Simplifying
-3 + -1r = 12

Solving
-3 + -1r = 12

Solving for variable 'r'.

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

Add '3' to each side of the equation.
-3 + 3 + -1r = 12 + 3

Combine like terms: -3 + 3 = 0
0 + -1r = 12 + 3
-1r = 12 + 3

Combine like terms: 12 + 3 = 15
-1r = 15

Divide each side by '-1'.
r = -15

Simplifying
r = -15

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