5(x-y)+2(x-y)-4(x-y)=

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5(x-y)+2(x-y)-4(x-y)=
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5(x-y)+2(x-y)-4(x-y)=
5(x-y)+2(x-y)-4(x-y)=

5(x-y)+2(x-y)-4(x-y)=
5(x-y)+2(x-y)-4(x-y)
= (5 +2 -4 )(x-y)
= 3 (x-y)
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5(x-y)+2(x-y)-4(x-y)
=(5+2-4)(x-y)
=3(x-y)
=3x-3y