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k in (-oo:+oo)
7/10-((1/5)*k) = k+83/50 // - k+83/50
7/10-((1/5)*k)-k-(83/50) = 0
(-1/5)*k-k+7/10-83/50 = 0
-6/5*k-24/25 = 0 // + 24/25
-6/5*k = 24/25 // : -6/5
k = 24/25/(-6/5)
k = -4/5
k = -4/5
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