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y in (-oo:+oo)
(3*y)/10-5 = y/5+4 // - y/5+4
(3*y)/10-(y/5)-5-4 = 0
1/10*y-9 = 0 // + 9
1/10*y = 9 // : 1/10
y = 9/1/10
y = 90
y = 90
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