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y in (-oo:+oo)
(3*y)/4-((2*y)/7) = 1 // - 1
(3*y)/4-((2*y)/7)-1 = 0
(3*y)/4+(-2/7)*y-1 = 0
13/28*y-1 = 0 // + 1
13/28*y = 1 // : 13/28
y = 1/13/28
y = 28/13
y = 28/13
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