7r-9=-3+15

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Solution for 7r-9=-3+15 equation: 


Simplifying
7r + -9 = -3 + 15

Reorder the terms:
-9 + 7r = -3 + 15

Combine like terms: -3 + 15 = 12
-9 + 7r = 12

Solving
-9 + 7r = 12

Solving for variable 'r'.

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

Add '9' to each side of the equation.
-9 + 9 + 7r = 12 + 9

Combine like terms: -9 + 9 = 0
0 + 7r = 12 + 9
7r = 12 + 9

Combine like terms: 12 + 9 = 21
7r = 21

Divide each side by '7'.
r = 3

Simplifying
r = 3

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