-18=12-3r

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Solution for -18=12-3r equation:


Simplifying
-18 = 12 + -3r

Solving
-18 = 12 + -3r

Solving for variable 'r'.

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

Add '3r' to each side of the equation.
-18 + 3r = 12 + -3r + 3r

Combine like terms: -3r + 3r = 0
-18 + 3r = 12 + 0
-18 + 3r = 12

Add '18' to each side of the equation.
-18 + 18 + 3r = 12 + 18

Combine like terms: -18 + 18 = 0
0 + 3r = 12 + 18
3r = 12 + 18

Combine like terms: 12 + 18 = 30
3r = 30

Divide each side by '3'.
r = 10

Simplifying
r = 10

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