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y in (-oo:+oo)
y = (1/3)*(4-(3*y))-2 // - (1/3)*(4-(3*y))-2
y-((1/3)*(4-(3*y)))+2 = 0
(-1/3)*(4-3*y)+y+2 = 0
y-1/3*(4-3*y)+2 = 0
y-1/3*(4-3*y)+2 = 0
2*y-4/3+2 = 0
2*y+2/3 = 0
2*y+2/3 = 0
2*y+2/3 = 0 // - 2/3
2*y = -2/3 // : 2
y = -2/3/2
y = -1/3
y = -1/3
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