7r-8-9r=-17

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Solution for 7r-8-9r=-17 equation:


Simplifying
7r + -8 + -9r = -17

Reorder the terms:
-8 + 7r + -9r = -17

Combine like terms: 7r + -9r = -2r
-8 + -2r = -17

Solving
-8 + -2r = -17

Solving for variable 'r'.

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

Add '8' to each side of the equation.
-8 + 8 + -2r = -17 + 8

Combine like terms: -8 + 8 = 0
0 + -2r = -17 + 8
-2r = -17 + 8

Combine like terms: -17 + 8 = -9
-2r = -9

Divide each side by '-2'.
r = 4.5

Simplifying
r = 4.5

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