-3(4+3r)=-57

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


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

Solving
-12 + -9r = -57

Solving for variable 'r'.

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

Add '12' to each side of the equation.
-12 + 12 + -9r = -57 + 12

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

Combine like terms: -57 + 12 = -45
-9r = -45

Divide each side by '-9'.
r = 5

Simplifying
r = 5

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