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y in (-oo:+oo)
(-7/2)*y-1 = (5/6)*y-(2/3) // - (5/6)*y-(2/3)
(-7/2)*y-((5/6)*y)+2/3-1 = 0
(-7/2)*y+(-5/6)*y+2/3-1 = 0
-13/3*y-1/3 = 0 // + 1/3
-13/3*y = 1/3 // : -13/3
y = 1/3/(-13/3)
y = -1/13
y = -1/13
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