84=-3(7x-7)

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


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

Reorder the terms:
84 = -3(-7 + 7x)
84 = (-7 * -3 + 7x * -3)
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 = -63
21x = -63

Divide each side by '21'.
x = -3

Simplifying
x = -3

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