6r-21+6r-15=

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Solution for 6r-21+6r-15= equation:


Simplifying
6r + -21 + 6r + -15 = 0

Reorder the terms:
-21 + -15 + 6r + 6r = 0

Combine like terms: -21 + -15 = -36
-36 + 6r + 6r = 0

Combine like terms: 6r + 6r = 12r
-36 + 12r = 0

Solving
-36 + 12r = 0

Solving for variable 'r'.

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

Add '36' to each side of the equation.
-36 + 36 + 12r = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 12r = 0 + 36
12r = 0 + 36

Combine like terms: 0 + 36 = 36
12r = 36

Divide each side by '12'.
r = 3

Simplifying
r = 3

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