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y in (-oo:+oo)
(-7/3)*(y-12)-((1/6)*y) = 0
(-7/3)*(y-12)+(-1/6)*y = 0
-7/3*(y-12)-y/6 = 0
(-7/3*6*(y-12))/6-y/6 = 0
-7/3*6*(y-12)-y = 0
168-15*y = 0
(168-15*y)/6 = 0
(168-15*y)/6 = 0 // * 6
168-15*y = 0
168-15*y = 0 // - 168
-15*y = -168 // : -15
y = -168/(-15)
y = 56/5
y = 56/5
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