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y in (-oo:+oo)
5/3-((7/4)*y) = 0
(-7/4)*y+5/3 = 0
5/3-7/4*y = 0 // - 5/3
-7/4*y = -5/3 // : -7/4
y = -5/3/(-7/4)
y = 20/21
y = 20/21
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