91=7(7-x)-7

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Solution for 91=7(7-x)-7 equation:


Simplifying
91 = 7(7 + -1x) + -7
91 = (7 * 7 + -1x * 7) + -7
91 = (49 + -7x) + -7

Reorder the terms:
91 = 49 + -7 + -7x

Combine like terms: 49 + -7 = 42
91 = 42 + -7x

Solving
91 = 42 + -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.
91 + 7x = 42 + -7x + 7x

Combine like terms: -7x + 7x = 0
91 + 7x = 42 + 0
91 + 7x = 42

Add '-91' to each side of the equation.
91 + -91 + 7x = 42 + -91

Combine like terms: 91 + -91 = 0
0 + 7x = 42 + -91
7x = 42 + -91

Combine like terms: 42 + -91 = -49
7x = -49

Divide each side by '7'.
x = -7

Simplifying
x = -7

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