-3(a+1)=57

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Solution for -3(a+1)=57 equation: 


Simplifying
-3(a + 1) = 57

Reorder the terms:
-3(1 + a) = 57
(1 * -3 + a * -3) = 57
(-3 + -3a) = 57

Solving
-3 + -3a = 57

Solving for variable 'a'.

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

Add '3' to each side of the equation.
-3 + 3 + -3a = 57 + 3

Combine like terms: -3 + 3 = 0
0 + -3a = 57 + 3
-3a = 57 + 3

Combine like terms: 57 + 3 = 60
-3a = 60

Divide each side by '-3'.
a = -20

Simplifying
a = -20

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