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y in (-oo:+oo)
(3/5)*y-((2/5)*y) = 50 // - 50
(3/5)*y-((2/5)*y)-50 = 0
(3/5)*y+(-2/5)*y-50 = 0
1/5*y-50 = 0 // + 50
1/5*y = 50 // : 1/5
y = 50/1/5
y = 250
y = 250
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