2(b+6)+7(b-1)=7b+12+7b-7=9b+5
10(b+9)-6(7-b)=10b+90-42+6b=16b+48
(b²+4)-(3-6b²)=b²+4-3+6b²=7b²+1
3(2b+11)+5(8-3b)=6b+33+40-15b=-9b+73
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2(b+6)+7(b-1)=7b+12+7b-7=9b+5
10(b+9)-6(7-b)=10b+90-42+6b=16b+48
(b²+4)-(3-6b²)=b²+4-3+6b²=7b²+1
3(2b+11)+5(8-3b)=6b+33+40-15b=-9b+73