(9b-9)-4(2b+3)=-5

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Solution for (9b-9)-4(2b+3)=-5 equation:


Simplifying
(9b + -9) + -4(2b + 3) = -5

Reorder the terms:
(-9 + 9b) + -4(2b + 3) = -5

Remove parenthesis around (-9 + 9b)
-9 + 9b + -4(2b + 3) = -5

Reorder the terms:
-9 + 9b + -4(3 + 2b) = -5
-9 + 9b + (3 * -4 + 2b * -4) = -5
-9 + 9b + (-12 + -8b) = -5

Reorder the terms:
-9 + -12 + 9b + -8b = -5

Combine like terms: -9 + -12 = -21
-21 + 9b + -8b = -5

Combine like terms: 9b + -8b = 1b
-21 + 1b = -5

Solving
-21 + 1b = -5

Solving for variable 'b'.

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

Add '21' to each side of the equation.
-21 + 21 + 1b = -5 + 21

Combine like terms: -21 + 21 = 0
0 + 1b = -5 + 21
1b = -5 + 21

Combine like terms: -5 + 21 = 16
1b = 16

Divide each side by '1'.
b = 16

Simplifying
b = 16

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