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y in (-oo:+oo)
3/4-((1/5)*((1/2)*y-7)) = 9*(y-(3/4)) // - 9*(y-(3/4))
3/4-((1/5)*((1/2)*y-7))-(9*(y-(3/4))) = 0
(-1/5)*((1/2)*y-7)-9*(y-3/4)+3/4 = 0
3/4-1/5*(1/2*y-7)-9*(y-3/4) = 0
(-1/5*4*(1/2*y-7))/4+(-9*4*(y-3/4))/4+3/4 = 0
3-1/5*4*(1/2*y-7)-9*4*(y-3/4) = 0
3-182/5*y+163/5 = 0
178/5-182/5*y = 0
(178/5-182/5*y)/4 = 0
(178/5-182/5*y)/4 = 0 // * 4
178/5-182/5*y = 0
178/5-182/5*y = 0 // - 178/5
-182/5*y = -178/5 // : -182/5
y = -178/5/(-182/5)
y = 89/91
y = 89/91
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