8r+9r=20r-3r+4-12

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Solution for 8r+9r=20r-3r+4-12 equation: 


Simplifying
8r + 9r = 20r + -3r + 4 + -12

Combine like terms: 8r + 9r = 17r
17r = 20r + -3r + 4 + -12

Reorder the terms:
17r = 4 + -12 + 20r + -3r

Combine like terms: 4 + -12 = -8
17r = -8 + 20r + -3r

Combine like terms: 20r + -3r = 17r
17r = -8 + 17r

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

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

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

Solving
0 = -8

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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