Solve for b
b = \frac{4}{3} = 1\frac{1}{3} \approx 1.333333333
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b=4-2b
Combine 3b and -2b to get b.
b+2b=4
Add 2b to both sides.
3b=4
Combine b and 2b to get 3b.
b=\frac{4}{3}
Divide both sides by 3.
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