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Geometry_Hater
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Isolate b
dw:1349396544371:dw
Can you go on from here?

MycahYj
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yes, thank you so much

Selorm
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group like term first: 3+9=2b+10b. then solve for b

Selorm
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that gives 12=12b. then divide both sides by the coefficient of b to get b alone