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y in (-oo:+oo)
(2*y)/5-(3/4) = (3*y)/20 // - (3*y)/20
(2*y)/5-((3*y)/20)-(3/4) = 0
(2*y)/5+(-3/20)*y-3/4 = 0
1/4*y-3/4 = 0 // + 3/4
1/4*y = 3/4 // : 1/4
y = 3/4/1/4
y = 3
y = 3
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