3r-12-5r+15=9

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Solution for 3r-12-5r+15=9 equation:


Simplifying
3r + -12 + -5r + 15 = 9

Reorder the terms:
-12 + 15 + 3r + -5r = 9

Combine like terms: -12 + 15 = 3
3 + 3r + -5r = 9

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

Solving
3 + -2r = 9

Solving for variable 'r'.

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

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

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

Combine like terms: 9 + -3 = 6
-2r = 6

Divide each side by '-2'.
r = -3

Simplifying
r = -3

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