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y in (-oo:+oo)
(7*y)/10-18 = (7/17)/40 // - (7/17)/40
(7*y)/10-((7/17)/40)-18 = 0
(7*y)/10-7/680-18 = 0
7/10*y-12247/680 = 0 // + 12247/680
7/10*y = 12247/680 // : 7/10
y = 12247/680/7/10
y = 12247/476
y = 12247/476
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