r+12+3r=5+9r-9

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Solution for r+12+3r=5+9r-9 equation:


Simplifying
r + 12 + 3r = 5 + 9r + -9

Reorder the terms:
12 + r + 3r = 5 + 9r + -9

Combine like terms: r + 3r = 4r
12 + 4r = 5 + 9r + -9

Reorder the terms:
12 + 4r = 5 + -9 + 9r

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

Solving
12 + 4r = -4 + 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.
12 + 4r + -9r = -4 + 9r + -9r

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

Combine like terms: 9r + -9r = 0
12 + -5r = -4 + 0
12 + -5r = -4

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

Combine like terms: 12 + -12 = 0
0 + -5r = -4 + -12
-5r = -4 + -12

Combine like terms: -4 + -12 = -16
-5r = -16

Divide each side by '-5'.
r = 3.2

Simplifying
r = 3.2

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