solve the equation
We need to put the equality sign in order to have an equation. If 5b - 6 - 3b = 6b - 21, then 2b - 6 = 6b - 21.
Add 21 to both sides: 2b + 15 = 6b
Subtract 2b from both sides: 15 = 4b
Divide both sides by 4: b = 15/4 = 3 3/4 = 3.75
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