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y in (-oo:+oo)
(1/2)*(y-5)+4 = (5/6)*(3*y-15) // - (5/6)*(3*y-15)
(1/2)*(y-5)-((5/6)*(3*y-15))+4 = 0
(1/2)*(y-5)+(-5/6)*(3*y-15)+4 = 0
1/2*(y-5)-5/6*(3*y-15)+4 = 0
1/2*(y-5)-5/6*(3*y-15)+4 = 0
4-2*y+10 = 0
14-2*y = 0
14-2*y = 0
14-2*y = 0 // - 14
-2*y = -14 // : -2
y = -14/(-2)
y = 7
y = 7
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