138=-3(3+7a)

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Solution for 138=-3(3+7a) equation:


Simplifying
138 = -3(3 + 7a)
138 = (3 * -3 + 7a * -3)
138 = (-9 + -21a)

Solving
138 = -9 + -21a

Solving for variable 'a'.

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

Add '21a' to each side of the equation.
138 + 21a = -9 + -21a + 21a

Combine like terms: -21a + 21a = 0
138 + 21a = -9 + 0
138 + 21a = -9

Add '-138' to each side of the equation.
138 + -138 + 21a = -9 + -138

Combine like terms: 138 + -138 = 0
0 + 21a = -9 + -138
21a = -9 + -138

Combine like terms: -9 + -138 = -147
21a = -147

Divide each side by '21'.
a = -7

Simplifying
a = -7

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