84=-6x-3(5x+7)

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Solution for 84=-6x-3(5x+7) equation:


Simplifying
84 = -6x + -3(5x + 7)

Reorder the terms:
84 = -6x + -3(7 + 5x)
84 = -6x + (7 * -3 + 5x * -3)
84 = -6x + (-21 + -15x)

Reorder the terms:
84 = -21 + -6x + -15x

Combine like terms: -6x + -15x = -21x
84 = -21 + -21x

Solving
84 = -21 + -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.
84 + 21x = -21 + -21x + 21x

Combine like terms: -21x + 21x = 0
84 + 21x = -21 + 0
84 + 21x = -21

Add '-84' to each side of the equation.
84 + -84 + 21x = -21 + -84

Combine like terms: 84 + -84 = 0
0 + 21x = -21 + -84
21x = -21 + -84

Combine like terms: -21 + -84 = -105
21x = -105

Divide each side by '21'.
x = -5

Simplifying
x = -5

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