Solve the following equation
b+b-15=75
Solve for b
b + b - 15 = 75
(1 + 1)b = 2b
2b - 15 = + 75
Group our constants -15 and 75. add 15 to both sides
2b - 15 + 15 = 75 + 15
2b = 90
b = 45
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