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y in (-oo:+oo)
(3*y-8)/4 = 5-((2*y-7)/2) // - 5-((2*y-7)/2)
(3*y-8)/4+(2*y-7)/2-5 = 0
(2*(3*y-8))/(2*4)+(4*(2*y-7))/(2*4)+(-5*2*4)/(2*4) = 0
2*(3*y-8)+4*(2*y-7)-5*2*4 = 0
14*y-44-40 = 0
14*y-84 = 0
(14*y-84)/(2*4) = 0
(14*y-84)/(2*4) = 0 // * 2*4
14*y-84 = 0
14*y-84 = 0 // + 84
14*y = 84 // : 14
y = 84/14
y = 6
y = 6
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