3(4+a)=-42

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Solution for 3(4+a)=-42 equation: 


Simplifying
3(4 + a) = -42
(4 * 3 + a * 3) = -42
(12 + 3a) = -42

Solving
12 + 3a = -42

Solving for variable 'a'.

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

Add '-12' to each side of the equation.
12 + -12 + 3a = -42 + -12

Combine like terms: 12 + -12 = 0
0 + 3a = -42 + -12
3a = -42 + -12

Combine like terms: -42 + -12 = -54
3a = -54

Divide each side by '3'.
a = -18

Simplifying
a = -18

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