(3х+2)-(5x+3y)=3x+2-5x-3y=-2x+2-3y
(m-n)-(n-m)=m-n-n+m=2m-2n
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(3х+2)-(5x+3y)=3x+2-5x-3y=-2x+2-3y
(m-n)-(n-m)=m-n-n+m=2m-2n