4) If A=x-2,B=y+2, and C = 2y-x. Then show that A+B+C = 3y.
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= A+B+C=3y
= x-2 + y+2 + 2y-x = 3y
= x-x +y+2y =3y
= 3y =3y
= y = 3/3
=y =1
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