9r-91=-7+8r

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Solution for 9r-91=-7+8r equation:


Simplifying
9r + -91 = -7 + 8r

Reorder the terms:
-91 + 9r = -7 + 8r

Solving
-91 + 9r = -7 + 8r

Solving for variable 'r'.

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

Add '-8r' to each side of the equation.
-91 + 9r + -8r = -7 + 8r + -8r

Combine like terms: 9r + -8r = 1r
-91 + 1r = -7 + 8r + -8r

Combine like terms: 8r + -8r = 0
-91 + 1r = -7 + 0
-91 + 1r = -7

Add '91' to each side of the equation.
-91 + 91 + 1r = -7 + 91

Combine like terms: -91 + 91 = 0
0 + 1r = -7 + 91
1r = -7 + 91

Combine like terms: -7 + 91 = 84
1r = 84

Divide each side by '1'.
r = 84

Simplifying
r = 84

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