2*x+y-(x+y)/2=2x+2y-(x+y)/2=(4x+4y)/2-(x+y)/2=(3x+3y)/2=1.5x+1.5y=1.5(x+y)
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2*x+y-(x+y)/2
=2x+2y-(x+y)/2
=(4x+4y)/2-(x+y)/2
=(3x+3y)/2
=1.5x+1.5y
=1.5(x+y)