-3(-7b+2)=90

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Solution for -3(-7b+2)=90 equation:


Simplifying
-3(-7b + 2) = 90

Reorder the terms:
-3(2 + -7b) = 90
(2 * -3 + -7b * -3) = 90
(-6 + 21b) = 90

Solving
-6 + 21b = 90

Solving for variable 'b'.

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

Add '6' to each side of the equation.
-6 + 6 + 21b = 90 + 6

Combine like terms: -6 + 6 = 0
0 + 21b = 90 + 6
21b = 90 + 6

Combine like terms: 90 + 6 = 96
21b = 96

Divide each side by '21'.
b = 4.571428571

Simplifying
b = 4.571428571

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