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Set up the equation: 3b-2=7. Solve for b: Subtract 2 from both sides: 3b=9. b=3.
I ask my 11 year old son. 2b + 18 = 4b Subtract 2b form each side: 18 = 2b Divide each side by 2: 9 = b which is the same as b = 9, but you knew that, didn't you?
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