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y in (-oo:+oo)
20 = (5*y)/7 // - (5*y)/7
20-((5*y)/7) = 0
(-5/7)*y+20 = 0
20-5/7*y = 0 // - 20
-5/7*y = -20 // : -5/7
y = -20/(-5/7)
y = 28
y = 28
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