9r+7=4r-8

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Solution for 9r+7=4r-8 equation:


Simplifying
9r + 7 = 4r + -8

Reorder the terms:
7 + 9r = 4r + -8

Reorder the terms:
7 + 9r = -8 + 4r

Solving
7 + 9r = -8 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
7 + 9r + -4r = -8 + 4r + -4r

Combine like terms: 9r + -4r = 5r
7 + 5r = -8 + 4r + -4r

Combine like terms: 4r + -4r = 0
7 + 5r = -8 + 0
7 + 5r = -8

Add '-7' to each side of the equation.
7 + -7 + 5r = -8 + -7

Combine like terms: 7 + -7 = 0
0 + 5r = -8 + -7
5r = -8 + -7

Combine like terms: -8 + -7 = -15
5r = -15

Divide each side by '5'.
r = -3

Simplifying
r = -3

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