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y in (-oo:+oo)
(-7/2)*(y-10)-((1/4)*y) = 0
(-7/2)*(y-10)+(-1/4)*y = 0
-7/2*(y-10)-y/4 = 0
(-7/2*4*(y-10))/4-y/4 = 0
-7/2*4*(y-10)-y = 0
140-15*y = 0
(140-15*y)/4 = 0
(140-15*y)/4 = 0 // * 4
140-15*y = 0
140-15*y = 0 // - 140
-15*y = -140 // : -15
y = -140/(-15)
y = 28/3
y = 28/3
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