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y in (-oo:+oo)
-((4/7)*y)-5/3 = 8/21 // - 8/21
-((4/7)*y)-5/3-(8/21) = 0
(-4/7)*y-5/3-8/21 = 0
-4/7*y-43/21 = 0 // + 43/21
-4/7*y = 43/21 // : -4/7
y = 43/21/(-4/7)
y = -43/12
y = -43/12
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