15=2-b-7

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Solution for 15=2-b-7 equation:


Simplifying
15 = 2 + -1b + -7

Reorder the terms:
15 = 2 + -7 + -1b

Combine like terms: 2 + -7 = -5
15 = -5 + -1b

Solving
15 = -5 + -1b

Solving for variable 'b'.

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

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

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

Add '-15' to each side of the equation.
15 + -15 + b = -5 + -15

Combine like terms: 15 + -15 = 0
0 + b = -5 + -15
b = -5 + -15

Combine like terms: -5 + -15 = -20
b = -20

Simplifying
b = -20

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