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y in (-oo:+oo)
y/0.4 = -4.2 // + 4.2
y/0.4+4.2 = 0
2.5*y+4.2 = 0 // - 4.2
2.5*y = -4.2 // : 2.5
y = -4.2/2.5
y = -1.68
y = -1.68
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