12r-15=3r+21

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Solution for 12r-15=3r+21 equation:


Simplifying
12r + -15 = 3r + 21

Reorder the terms:
-15 + 12r = 3r + 21

Reorder the terms:
-15 + 12r = 21 + 3r

Solving
-15 + 12r = 21 + 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.
-15 + 12r + -3r = 21 + 3r + -3r

Combine like terms: 12r + -3r = 9r
-15 + 9r = 21 + 3r + -3r

Combine like terms: 3r + -3r = 0
-15 + 9r = 21 + 0
-15 + 9r = 21

Add '15' to each side of the equation.
-15 + 15 + 9r = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 9r = 21 + 15
9r = 21 + 15

Combine like terms: 21 + 15 = 36
9r = 36

Divide each side by '9'.
r = 4

Simplifying
r = 4

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