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y in (-oo:+oo)
4-(4.5*y) = 2*y-((2/3)*(8*y-10)) // - 2*y-((2/3)*(8*y-10))
(2/3)*(8*y-10)-(4.5*y)-(2*y)+4 = 0
(2/3)*(8*y-10)-4.5*y-2*y+4 = 0
2/3*(8*y-10)-4.5*y-2*y+4 = 0
2/3*(8*y-10)-4.5*y-2*y+4 = 0
0.83333333*y-2*y-20/3+4 = 0
4-1.16666667*y-20/3 = 0
-1.16666667*y-8/3 = 0
-1.16666667*y-8/3 = 0
-1.16666667*y-8/3 = 0 // + 8/3
-1.16666667*y = 8/3 // : -1.16666667
y = 8/3/(-1.16666667)
y = -2.28571428
y = -2.28571428
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