5r+9=2r-12

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Solution for 5r+9=2r-12 equation:


Simplifying
5r + 9 = 2r + -12

Reorder the terms:
9 + 5r = 2r + -12

Reorder the terms:
9 + 5r = -12 + 2r

Solving
9 + 5r = -12 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
9 + 5r + -2r = -12 + 2r + -2r

Combine like terms: 5r + -2r = 3r
9 + 3r = -12 + 2r + -2r

Combine like terms: 2r + -2r = 0
9 + 3r = -12 + 0
9 + 3r = -12

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

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

Combine like terms: -12 + -9 = -21
3r = -21

Divide each side by '3'.
r = -7

Simplifying
r = -7

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