15=-6+3r

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Solution for 15=-6+3r equation: 


Simplifying
15 = -6 + 3r

Solving
15 = -6 + 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 + -3r = -6 + 3r + -3r

Combine like terms: 3r + -3r = 0
15 + -3r = -6 + 0
15 + -3r = -6

Add '-15' to each side of the equation.
15 + -15 + -3r = -6 + -15

Combine like terms: 15 + -15 = 0
0 + -3r = -6 + -15
-3r = -6 + -15

Combine like terms: -6 + -15 = -21
-3r = -21

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

Simplifying
r = 7

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