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y in (-oo:+oo)
3*y+3.9*(9/2) = 15 // - 15
3*y+3.9*(9/2)-15 = 0
3*y+2.55 = 0 // - 2.55
3*y = -2.55 // : 3
y = -2.55/3
y = -0.85
y = -0.85
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