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x+2/3 = y+4/3 /×3
4x+6=2y+6
x+2=y+4
4x-2y=6-6
x-y=4-2
4x-2y=0
x=2+y
4(2+y)-2y=0
x=2+y
8+4y-2y=0
x=2+y
8+2y=0
x=2+y
2y=-8/2
x=2+y
y=-4
x=2+(-4)
y=-4
x=-2