(20-x)7=91

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Solution for (20-x)7=91 equation:


Simplifying
(20 + -1x) * 7 = 91

Reorder the terms for easier multiplication:
7(20 + -1x) = 91
(20 * 7 + -1x * 7) = 91
(140 + -7x) = 91

Solving
140 + -7x = 91

Solving for variable 'x'.

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

Add '-140' to each side of the equation.
140 + -140 + -7x = 91 + -140

Combine like terms: 140 + -140 = 0
0 + -7x = 91 + -140
-7x = 91 + -140

Combine like terms: 91 + -140 = -49
-7x = -49

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

Simplifying
x = 7

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