7r-15=-7+9r

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Solution for 7r-15=-7+9r equation:


Simplifying
7r + -15 = -7 + 9r

Reorder the terms:
-15 + 7r = -7 + 9r

Solving
-15 + 7r = -7 + 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.
-15 + 7r + -9r = -7 + 9r + -9r

Combine like terms: 7r + -9r = -2r
-15 + -2r = -7 + 9r + -9r

Combine like terms: 9r + -9r = 0
-15 + -2r = -7 + 0
-15 + -2r = -7

Add '15' to each side of the equation.
-15 + 15 + -2r = -7 + 15

Combine like terms: -15 + 15 = 0
0 + -2r = -7 + 15
-2r = -7 + 15

Combine like terms: -7 + 15 = 8
-2r = 8

Divide each side by '-2'.
r = -4

Simplifying
r = -4

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