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y in (-oo:+oo)
(3/5)*y+(2/3)*y = 120 // - 120
(3/5)*y+(2/3)*y-120 = 0
19/15*y-120 = 0 // + 120
19/15*y = 120 // : 19/15
y = 120/19/15
y = 1800/19
y = 1800/19
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