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b)= -11x - 10y
c)= -5a + 4a - 7a= -8a
d)= 5x - 10 + 2x + 3 = 7x - 7
e)= -3x + 21 + 2x + 4 = -x +25
b) -5x+3y-6x-13y=-11x-10y
c) -5a-(-4a)-7a=-5a+4a-7a=-8a
d) 5(x-2)+2x+3=5x-10+2x+3=7x-7
e) -3(x-7)+2(x+2)=-3x+21+2x+4=-x+25