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