15r-15r+r+3r-3r=12

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


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

Combine like terms: 15r + -15r = 0
0 + r + 3r + -3r = 12
r + 3r + -3r = 12

Combine like terms: r + 3r = 4r
4r + -3r = 12

Combine like terms: 4r + -3r = 1r
1r = 12

Solving
1r = 12

Solving for variable 'r'.

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

Divide each side by '1'.
r = 12

Simplifying
r = 12

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