18=-2r-7r

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


Simplifying
18 = -2r + -7r

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

Solving
18 = -9r

Solving for variable 'r'.

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

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

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

Add '-18' to each side of the equation.
18 + -18 + 9r = 0 + -18

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

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

Divide each side by '9'.
r = -2

Simplifying
r = -2

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