87=3x-7(3x+3)

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Solution for 87=3x-7(3x+3) equation:


Simplifying
87 = 3x + -7(3x + 3)

Reorder the terms:
87 = 3x + -7(3 + 3x)
87 = 3x + (3 * -7 + 3x * -7)
87 = 3x + (-21 + -21x)

Reorder the terms:
87 = -21 + 3x + -21x

Combine like terms: 3x + -21x = -18x
87 = -21 + -18x

Solving
87 = -21 + -18x

Solving for variable 'x'.

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

Add '18x' to each side of the equation.
87 + 18x = -21 + -18x + 18x

Combine like terms: -18x + 18x = 0
87 + 18x = -21 + 0
87 + 18x = -21

Add '-87' to each side of the equation.
87 + -87 + 18x = -21 + -87

Combine like terms: 87 + -87 = 0
0 + 18x = -21 + -87
18x = -21 + -87

Combine like terms: -21 + -87 = -108
18x = -108

Divide each side by '18'.
x = -6

Simplifying
x = -6

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