18-12r=90

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Solution for 18-12r=90 equation: 


Simplifying
18 + -12r = 90

Solving
18 + -12r = 90

Solving for variable 'r'.

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

Add '-18' to each side of the equation.
18 + -18 + -12r = 90 + -18

Combine like terms: 18 + -18 = 0
0 + -12r = 90 + -18
-12r = 90 + -18

Combine like terms: 90 + -18 = 72
-12r = 72

Divide each side by '-12'.
r = -6

Simplifying
r = -6

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