15−63b=1015-\frac{6}{3}b=10
1
Simplify  63\frac{6}{3}  to  22.
15−2b=1015-2b=10

2
Subtract 1515 from both sides.
−2b=10−15-2b=10-15

3
Simplify  10−1510-15  to  −5-5.
−2b=−5-2b=-5

4
Divide both sides by −2-2.
b=−5−2b=\frac{-5}{-2}

5
Two negatives make a positive.
b=52b=\frac{5}{2}

Done

Decimal Form: 2.5

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