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y in (-oo:+oo)
(-7/5)*(y-10)-((1/15)*y) = 0
(-7/5)*(y-10)+(-1/15)*y = 0
-7/5*(y-10)-y/15 = 0
(-7/5*15*(y-10))/15-y/15 = 0
-7/5*15*(y-10)-y = 0
210-22*y = 0
(210-22*y)/15 = 0
(210-22*y)/15 = 0 // * 15
210-22*y = 0
210-22*y = 0 // - 210
-22*y = -210 // : -22
y = -210/(-22)
y = 105/11
y = 105/11
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