9+4r-1=9r+12-4r

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Solution for 9+4r-1=9r+12-4r equation:


Simplifying
9 + 4r + -1 = 9r + 12 + -4r

Reorder the terms:
9 + -1 + 4r = 9r + 12 + -4r

Combine like terms: 9 + -1 = 8
8 + 4r = 9r + 12 + -4r

Reorder the terms:
8 + 4r = 12 + 9r + -4r

Combine like terms: 9r + -4r = 5r
8 + 4r = 12 + 5r

Solving
8 + 4r = 12 + 5r

Solving for variable 'r'.

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

Add '-5r' to each side of the equation.
8 + 4r + -5r = 12 + 5r + -5r

Combine like terms: 4r + -5r = -1r
8 + -1r = 12 + 5r + -5r

Combine like terms: 5r + -5r = 0
8 + -1r = 12 + 0
8 + -1r = 12

Add '-8' to each side of the equation.
8 + -8 + -1r = 12 + -8

Combine like terms: 8 + -8 = 0
0 + -1r = 12 + -8
-1r = 12 + -8

Combine like terms: 12 + -8 = 4
-1r = 4

Divide each side by '-1'.
r = -4

Simplifying
r = -4

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