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b)2a-3a+7-6=-a+1 g)2x-6+4x+2=6x-4
c)2x-5x+7-x=2x+7 h)3y-5-5y-6=-2y-11
d)2a+b-4b=2a-3b i)-2a+2b-3a-3b=-5a+b
e)x-2x+3+x-4=-1 l)1/2t-2x+3t-x-t=3,5t-3x