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y in (-oo:+oo)
y+10 = (9/2)*(y-10) // - (9/2)*(y-10)
y-((9/2)*(y-10))+10 = 0
(-9/2)*(y-10)+y+10 = 0
y-9/2*(y-10)+10 = 0
y-9/2*(y-10)+10 = 0
10-7/2*y+45 = 0
55-7/2*y = 0
55-7/2*y = 0
55-7/2*y = 0 // - 55
-7/2*y = -55 // : -7/2
y = -55/(-7/2)
y = 110/7
y = 110/7
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