3(3+4r)=57

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Solution for 3(3+4r)=57 equation: 


Simplifying
3(3 + 4r) = 57
(3 * 3 + 4r * 3) = 57
(9 + 12r) = 57

Solving
9 + 12r = 57

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 + 12r = 57 + -9

Combine like terms: 9 + -9 = 0
0 + 12r = 57 + -9
12r = 57 + -9

Combine like terms: 57 + -9 = 48
12r = 48

Divide each side by '12'.
r = 4

Simplifying
r = 4

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