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y in (-oo:+oo)
2*(47-((7*y)/2)) = 0
2*((-7/2)*y+47) = 0
2*(47-7/2*y) = 0
47-7/2*y = 0 // - 47
-7/2*y = -47 // : -7/2
y = -47/(-7/2)
y = 94/7
y = 94/7
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