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d)-x²+2x-3x+x²=-x
e) 4x+4-7x-1/2=-3x+3½
f) -2ab+12a-4ab-16a=-6ab-4a
d) -x²+2x-3x+x²= -1x
e) 4x+4-7x-1/2= -3x + 3,5
f) -2ab+12a-4ab-16a= -6ab -4a