85=x-7(-3-x)

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Solution for 85=x-7(-3-x) equation:


Simplifying
85 = x + -7(-3 + -1x)
85 = x + (-3 * -7 + -1x * -7)
85 = x + (21 + 7x)

Reorder the terms:
85 = 21 + x + 7x

Combine like terms: x + 7x = 8x
85 = 21 + 8x

Solving
85 = 21 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
85 + -8x = 21 + 8x + -8x

Combine like terms: 8x + -8x = 0
85 + -8x = 21 + 0
85 + -8x = 21

Add '-85' to each side of the equation.
85 + -85 + -8x = 21 + -85

Combine like terms: 85 + -85 = 0
0 + -8x = 21 + -85
-8x = 21 + -85

Combine like terms: 21 + -85 = -64
-8x = -64

Divide each side by '-8'.
x = 8

Simplifying
x = 8

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