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y in (-oo:+oo)
y/2.5 = -2.5 // + 2.5
y/2.5+2.5 = 0
0.4*y+2.5 = 0 // - 2.5
0.4*y = -2.5 // : 0.4
y = -2.5/0.4
y = -6.25
y = -6.25
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