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y in (-oo:+oo)
(-7/3)*(y-15)-((1/6)*y) = 0
(-7/3)*(y-15)+(-1/6)*y = 0
-7/3*(y-15)-y/6 = 0
(-7/3*6*(y-15))/6-y/6 = 0
-7/3*6*(y-15)-y = 0
210-15*y = 0
(210-15*y)/6 = 0
(210-15*y)/6 = 0 // * 6
210-15*y = 0
210-15*y = 0 // - 210
-15*y = -210 // : -15
y = -210/(-15)
y = 14
y = 14
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