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y in (-oo:+oo)
y/4 = (y-7)/10 // - (y-7)/10
y/4-((y-7)/10) = 0
(-1*(y-7))/10+y/4 = 0
(-1*4*(y-7))/(4*10)+(10*y)/(4*10) = 0
10*y-1*4*(y-7) = 0
6*y+28 = 0
(6*y+28)/(4*10) = 0
(6*y+28)/(4*10) = 0 // * 4*10
6*y+28 = 0
6*y+28 = 0 // - 28
6*y = -28 // : 6
y = -28/6
y = -14/3
y = -14/3
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