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a=5-(x-y)+(y+2x)
a=5-x+y+y+2x
a=x+2y+5
a=1/2+2*2+5
a=9,5
b=(x-2y+xy)-(x+y)
b=x-2y+xy-x-y
b=-3y+xy
b=-3*2+1/2*2
b=-5
a>b
2)
3(x-7)=3x-21
-4(x+8) = -4x-32
(5x+2y-4)*5 = 25x+10y-20