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y in (-oo:+oo)
2*y+10 = (5/2)*y // - (5/2)*y
2*y-((5/2)*y)+10 = 0
2*y+(-5/2)*y+10 = 0
10-1/2*y = 0 // - 10
-1/2*y = -10 // : -1/2
y = -10/(-1/2)
y = 20
y = 20
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