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y in (-oo:+oo)
7-((1/5)*y) = 3 // - 3
7-((1/5)*y)-3 = 0
(-1/5)*y-3+7 = 0
4-1/5*y = 0 // - 4
-1/5*y = -4 // : -1/5
y = -4/(-1/5)
y = 20
y = 20
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