-5(9+b)=-90

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Solution for -5(9+b)=-90 equation: 


Simplifying
-5(9 + b) = -90
(9 * -5 + b * -5) = -90
(-45 + -5b) = -90

Solving
-45 + -5b = -90

Solving for variable 'b'.

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

Add '45' to each side of the equation.
-45 + 45 + -5b = -90 + 45

Combine like terms: -45 + 45 = 0
0 + -5b = -90 + 45
-5b = -90 + 45

Combine like terms: -90 + 45 = -45
-5b = -45

Divide each side by '-5'.
b = 9

Simplifying
b = 9

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