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x in (-oo:+oo)
(3/7)*x-(1/5) = 13/35 // - 13/35
(3/7)*x-(1/5)-(13/35) = 0
(3/7)*x-1/5-13/35 = 0
3/7*x-4/7 = 0 // + 4/7
3/7*x = 4/7 // : 3/7
x = 4/7/3/7
x = 4/3
x = 4/3
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