-138=-8b-7(b+9)

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Solution for -138=-8b-7(b+9) equation:


Simplifying
-138 = -8b + -7(b + 9)

Reorder the terms:
-138 = -8b + -7(9 + b)
-138 = -8b + (9 * -7 + b * -7)
-138 = -8b + (-63 + -7b)

Reorder the terms:
-138 = -63 + -8b + -7b

Combine like terms: -8b + -7b = -15b
-138 = -63 + -15b

Solving
-138 = -63 + -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.
-138 + 15b = -63 + -15b + 15b

Combine like terms: -15b + 15b = 0
-138 + 15b = -63 + 0
-138 + 15b = -63

Add '138' to each side of the equation.
-138 + 138 + 15b = -63 + 138

Combine like terms: -138 + 138 = 0
0 + 15b = -63 + 138
15b = -63 + 138

Combine like terms: -63 + 138 = 75
15b = 75

Divide each side by '15'.
b = 5

Simplifying
b = 5

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