90=3(5b-5)

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Solution for 90=3(5b-5) equation:


Simplifying
90 = 3(5b + -5)

Reorder the terms:
90 = 3(-5 + 5b)
90 = (-5 * 3 + 5b * 3)
90 = (-15 + 15b)

Solving
90 = -15 + 15b

Solving for variable 'b'.

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

Add '-15b' to each side of the equation.
90 + -15b = -15 + 15b + -15b

Combine like terms: 15b + -15b = 0
90 + -15b = -15 + 0
90 + -15b = -15

Add '-90' to each side of the equation.
90 + -90 + -15b = -15 + -90

Combine like terms: 90 + -90 = 0
0 + -15b = -15 + -90
-15b = -15 + -90

Combine like terms: -15 + -90 = -105
-15b = -105

Divide each side by '-15'.
b = 7

Simplifying
b = 7

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