138=-3(3+7x)

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


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

Solving
138 = -9 + -21x

Solving for variable 'x'.

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

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

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

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

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

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

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

Simplifying
x = -7

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