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b) (3-7)*(15-6)=(-4)*9=(-36)
c) (17-5):(-3)=12:(-3)=-4
d) (-23-4):(-28+19)=-27:(-9)=(-3)
e) (-5)*2*(-7)=(-10)*(-7)=70
f) (-3)*(-2)*(-4)=6*(-4)=(-24)
g) ((-6)*(-5)):(-15)=30:(-15)=(-2)
h) (19-49):(-6)*5=((-30:(-6))*5=5*5=25
i) (-5)*(-2)+6*(-3)=10+(-18)=(-8)
j) (-25):(-2+7)-3=(-25):5-3=(-5)-3=(-8)