81=3x-3(5x+13)

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Solution for 81=3x-3(5x+13) equation:


Simplifying
81 = 3x + -3(5x + 13)

Reorder the terms:
81 = 3x + -3(13 + 5x)
81 = 3x + (13 * -3 + 5x * -3)
81 = 3x + (-39 + -15x)

Reorder the terms:
81 = -39 + 3x + -15x

Combine like terms: 3x + -15x = -12x
81 = -39 + -12x

Solving
81 = -39 + -12x

Solving for variable 'x'.

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

Add '12x' to each side of the equation.
81 + 12x = -39 + -12x + 12x

Combine like terms: -12x + 12x = 0
81 + 12x = -39 + 0
81 + 12x = -39

Add '-81' to each side of the equation.
81 + -81 + 12x = -39 + -81

Combine like terms: 81 + -81 = 0
0 + 12x = -39 + -81
12x = -39 + -81

Combine like terms: -39 + -81 = -120
12x = -120

Divide each side by '12'.
x = -10

Simplifying
x = -10

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