-2-r-7=12

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Solution for -2-r-7=12 equation:


Simplifying
-2 + -1r + -7 = 12

Reorder the terms:
-2 + -7 + -1r = 12

Combine like terms: -2 + -7 = -9
-9 + -1r = 12

Solving
-9 + -1r = 12

Solving for variable 'r'.

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

Add '9' to each side of the equation.
-9 + 9 + -1r = 12 + 9

Combine like terms: -9 + 9 = 0
0 + -1r = 12 + 9
-1r = 12 + 9

Combine like terms: 12 + 9 = 21
-1r = 21

Divide each side by '-1'.
r = -21

Simplifying
r = -21

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