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y in (-oo:+oo)
40.77 = y/5+2.4*y+7/10 // - y/5+2.4*y+7/10
40.77-(y/5)-(2.4*y)-(7/10) = 0
40.77-(y/5)-2.4*y-7/10 = 0
40.07-2.6*y = 0 // - 40.07
-2.6*y = -40.07 // : -2.6
y = -40.07/(-2.6)
y = 15.41153846
y = 15.41153846
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