-18=7r-2+9r

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


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

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

Combine like terms: 7r + 9r = 16r
-18 = -2 + 16r

Solving
-18 = -2 + 16r

Solving for variable 'r'.

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

Add '-16r' to each side of the equation.
-18 + -16r = -2 + 16r + -16r

Combine like terms: 16r + -16r = 0
-18 + -16r = -2 + 0
-18 + -16r = -2

Add '18' to each side of the equation.
-18 + 18 + -16r = -2 + 18

Combine like terms: -18 + 18 = 0
0 + -16r = -2 + 18
-16r = -2 + 18

Combine like terms: -2 + 18 = 16
-16r = 16

Divide each side by '-16'.
r = -1

Simplifying
r = -1

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