84=7x-7(2x-20)

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Solution for 84=7x-7(2x-20) equation:


Simplifying
84 = 7x + -7(2x + -20)

Reorder the terms:
84 = 7x + -7(-20 + 2x)
84 = 7x + (-20 * -7 + 2x * -7)
84 = 7x + (140 + -14x)

Reorder the terms:
84 = 140 + 7x + -14x

Combine like terms: 7x + -14x = -7x
84 = 140 + -7x

Solving
84 = 140 + -7x

Solving for variable 'x'.

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

Add '7x' to each side of the equation.
84 + 7x = 140 + -7x + 7x

Combine like terms: -7x + 7x = 0
84 + 7x = 140 + 0
84 + 7x = 140

Add '-84' to each side of the equation.
84 + -84 + 7x = 140 + -84

Combine like terms: 84 + -84 = 0
0 + 7x = 140 + -84
7x = 140 + -84

Combine like terms: 140 + -84 = 56
7x = 56

Divide each side by '7'.
x = 8

Simplifying
x = 8

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