90=7(3m-8)-1

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Solution for 90=7(3m-8)-1 equation: 


Simplifying
90 = 7(3m + -8) + -1

Reorder the terms:
90 = 7(-8 + 3m) + -1
90 = (-8 * 7 + 3m * 7) + -1
90 = (-56 + 21m) + -1

Reorder the terms:
90 = -56 + -1 + 21m

Combine like terms: -56 + -1 = -57
90 = -57 + 21m

Solving
90 = -57 + 21m

Solving for variable 'm'.

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

Add '-21m' to each side of the equation.
90 + -21m = -57 + 21m + -21m

Combine like terms: 21m + -21m = 0
90 + -21m = -57 + 0
90 + -21m = -57

Add '-90' to each side of the equation.
90 + -90 + -21m = -57 + -90

Combine like terms: 90 + -90 = 0
0 + -21m = -57 + -90
-21m = -57 + -90

Combine like terms: -57 + -90 = -147
-21m = -147

Divide each side by '-21'.
m = 7

Simplifying
m = 7

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