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y in (-oo:+oo)
(-39/4)*y+1+6 = y // - y
(-39/4)*y-y+1+6 = 0
7-43/4*y = 0 // - 7
-43/4*y = -7 // : -43/4
y = -7/(-43/4)
y = 28/43
y = 28/43
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