12r+3r=225

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Solution for 12r+3r=225 equation: 


Simplifying
12r + 3r = 225

Combine like terms: 12r + 3r = 15r
15r = 225

Solving
15r = 225

Solving for variable 'r'.

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

Divide each side by '15'.
r = 15

Simplifying
r = 15

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