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y in (-oo:+oo)
(3*y)/10-2 = y/5+5 // - y/5+5
(3*y)/10-(y/5)-5-2 = 0
1/10*y-7 = 0 // + 7
1/10*y = 7 // : 1/10
y = 7/1/10
y = 70
y = 70
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