-3(4+5b)=-57

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Solution for -3(4+5b)=-57 equation: 


Simplifying
-3(4 + 5b) = -57
(4 * -3 + 5b * -3) = -57
(-12 + -15b) = -57

Solving
-12 + -15b = -57

Solving for variable 'b'.

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

Add '12' to each side of the equation.
-12 + 12 + -15b = -57 + 12

Combine like terms: -12 + 12 = 0
0 + -15b = -57 + 12
-15b = -57 + 12

Combine like terms: -57 + 12 = -45
-15b = -45

Divide each side by '-15'.
b = 3

Simplifying
b = 3

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