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b. 20
c. 0
d. 7
(9)
a. x-2y+7x-5y-4x+3y=4x-4y
b. 2(x-2y)- (7x-5y)= 2x-4y-7x+5y= y-5x
c. -3(x-2y)+2(-4x+3y)= -3x+2y-8x+6y= 8y-11x
d. 5(x-2y)-(7x-5y)= 5x-10y-7x+5y= -2x-5y