4r+12-2r=3r-9

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Solution for 4r+12-2r=3r-9 equation:


Simplifying
4r + 12 + -2r = 3r + -9

Reorder the terms:
12 + 4r + -2r = 3r + -9

Combine like terms: 4r + -2r = 2r
12 + 2r = 3r + -9

Reorder the terms:
12 + 2r = -9 + 3r

Solving
12 + 2r = -9 + 3r

Solving for variable 'r'.

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

Add '-3r' to each side of the equation.
12 + 2r + -3r = -9 + 3r + -3r

Combine like terms: 2r + -3r = -1r
12 + -1r = -9 + 3r + -3r

Combine like terms: 3r + -3r = 0
12 + -1r = -9 + 0
12 + -1r = -9

Add '-12' to each side of the equation.
12 + -12 + -1r = -9 + -12

Combine like terms: 12 + -12 = 0
0 + -1r = -9 + -12
-1r = -9 + -12

Combine like terms: -9 + -12 = -21
-1r = -21

Divide each side by '-1'.
r = 21

Simplifying
r = 21

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