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b) 3*(-7) -7 * (-2)=-21+14=-7
c) 6 * (-4) + 5 * (-9)=-24-45=-69
d) (-18) : 9 - (-27) : (-1)=-2+27:1=-2+27=25
b) 3* (-7) -7 *(-2) = -21 - (-14) = -7
c) 6*(-4) + 5*(-9) = -24 + (-45) = -69
d) (-18):9 - (-27): (-1) = -2 - 27 = -29