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y in (-oo:+oo)
y/1.5 = 2.8 // - 2.8
y/1.5-2.8 = 0
0.66666667*y-2.8 = 0 // + 2.8
0.66666667*y = 2.8 // : 0.66666667
y = 2.8/0.66666667
y = 4.19999998
y = 4.19999998
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