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y in (-oo:+oo)
(3*y)/4-((2*y)/9) = 1 // - 1
(3*y)/4-((2*y)/9)-1 = 0
(3*y)/4+(-2/9)*y-1 = 0
19/36*y-1 = 0 // + 1
19/36*y = 1 // : 19/36
y = 1/19/36
y = 36/19
y = 36/19
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