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b)-3/7+41/2=-6/14+287/14=281/14
c)14/5-2/3=42/15-10/15=52/15
d)1/90+(-3/16)=1/90-3/16=16/1440-270/1440=-254/1440=-129/720=43/240
e)-2/5-(7/9)=-2/5-7/9=18/45-35/45=-17/45
f)-5/3+16/9=-45/27+48/27=3/27=1/9
g)13/7-13/8=104/56-91/56=13/56
h)(-2/11)+(-4/15)=-2/11-4/15=-30/165-44/165=-14/165
i)(12/5)-(-1/14)=-12/5+1/14=168/70+5/70=173/15
j)-(-3/8)+(2/7)=3/8+2/7=21/56+16/56=37/56