-2r+18-9=-18+7r

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Solution for -2r+18-9=-18+7r equation:


Simplifying
-2r + 18 + -9 = -18 + 7r

Reorder the terms:
18 + -9 + -2r = -18 + 7r

Combine like terms: 18 + -9 = 9
9 + -2r = -18 + 7r

Solving
9 + -2r = -18 + 7r

Solving for variable 'r'.

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

Add '-7r' to each side of the equation.
9 + -2r + -7r = -18 + 7r + -7r

Combine like terms: -2r + -7r = -9r
9 + -9r = -18 + 7r + -7r

Combine like terms: 7r + -7r = 0
9 + -9r = -18 + 0
9 + -9r = -18

Add '-9' to each side of the equation.
9 + -9 + -9r = -18 + -9

Combine like terms: 9 + -9 = 0
0 + -9r = -18 + -9
-9r = -18 + -9

Combine like terms: -18 + -9 = -27
-9r = -27

Divide each side by '-9'.
r = 3

Simplifying
r = 3

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