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# y= x-3
x=(0)(-3)> y=x-
0=x-3
x= -3
y= (-3)(0)> y=x-3
y=0-3
y=-3
# y=2 x
x=(0)(2)>y=2 x
0=2 x
x =2
y=(0)(0)>2 x
y=2x
y=2(0)
y= 0