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y in (-oo:+oo)
2.4*y = 1/2-7 // - 1/2-7
2.4*y-(1/2)+7 = 0
2.4*y-1/2+7 = 0
2.4*y+13/2 = 0 // - 13/2
2.4*y = -13/2 // : 2.4
y = -13/2/2.4
y = -2.70833333
y = -2.70833333
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