B+45=2b-90

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Solution for B+45=2b-90 equation: 


Simplifying
B + 45 = 2b + -90

Reorder the terms:
45 + B = 2b + -90

Reorder the terms:
45 + B = -90 + 2b

Solving
45 + B = -90 + 2b

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 + B = -90 + -45 + 2b

Combine like terms: 45 + -45 = 0
0 + B = -90 + -45 + 2b
B = -90 + -45 + 2b

Combine like terms: -90 + -45 = -135
B = -135 + 2b

Simplifying
B = -135 + 2b

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