138=2b+25-(-7b)

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Solution for 138=2b+25-(-7b) equation:


Simplifying
138 = 2b + 25 + -1(-7b)

Remove parenthesis around (-7b)
138 = 2b + 25 + -1 * -7b

Multiply -1 * -7
138 = 2b + 25 + 7b

Reorder the terms:
138 = 25 + 2b + 7b

Combine like terms: 2b + 7b = 9b
138 = 25 + 9b

Solving
138 = 25 + 9b

Solving for variable 'b'.

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

Add '-9b' to each side of the equation.
138 + -9b = 25 + 9b + -9b

Combine like terms: 9b + -9b = 0
138 + -9b = 25 + 0
138 + -9b = 25

Add '-138' to each side of the equation.
138 + -138 + -9b = 25 + -138

Combine like terms: 138 + -138 = 0
0 + -9b = 25 + -138
-9b = 25 + -138

Combine like terms: 25 + -138 = -113
-9b = -113

Divide each side by '-9'.
b = 12.55555556

Simplifying
b = 12.55555556

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