18=7r-8r

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Solution for 18=7r-8r equation:


Simplifying
18 = 7r + -8r

Combine like terms: 7r + -8r = -1r
18 = -1r

Solving
18 = -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
18 + r = -1r + r

Combine like terms: -1r + r = 0
18 + r = 0

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

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

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

Simplifying
r = -18

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