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y in (-oo:+oo)
(-7/5)*(y-20)-((1/15)*y) = 0
(-7/5)*(y-20)+(-1/15)*y = 0
-7/5*(y-20)-y/15 = 0
(-7/5*15*(y-20))/15-y/15 = 0
-7/5*15*(y-20)-y = 0
420-22*y = 0
(420-22*y)/15 = 0
(420-22*y)/15 = 0 // * 15
420-22*y = 0
420-22*y = 0 // - 420
-22*y = -420 // : -22
y = -420/(-22)
y = 210/11
y = 210/11
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