7(-8+3x)=91

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Solution for 7(-8+3x)=91 equation: 


Simplifying
7(-8 + 3x) = 91
(-8 * 7 + 3x * 7) = 91
(-56 + 21x) = 91

Solving
-56 + 21x = 91

Solving for variable 'x'.

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

Add '56' to each side of the equation.
-56 + 56 + 21x = 91 + 56

Combine like terms: -56 + 56 = 0
0 + 21x = 91 + 56
21x = 91 + 56

Combine like terms: 91 + 56 = 147
21x = 147

Divide each side by '21'.
x = 7

Simplifying
x = 7

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