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y in (-oo:+oo)
(1/6)*(18*y+18)-7 = (-1/5)*(5*y-20) // - (-1/5)*(5*y-20)
(1/6)*(18*y+18)-((-1/5)*(5*y-20))-7 = 0
(1/6)*(18*y+18)+(1/5)*(5*y-20)-7 = 0
1/6*(18*y+18)+1/5*(5*y-20)-7 = 0
1/6*(18*y+18)+1/5*(5*y-20)-7 = 0
4*y-7-1 = 0
4*y-8 = 0
4*y-8 = 0
4*y-8 = 0 // + 8
4*y = 8 // : 4
y = 8/4
y = 2
y = 2
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