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x in (-oo:+oo)
(1/7)*x+1/5 = 13/70 // - 13/70
(1/7)*x+1/5-(13/70) = 0
(1/7)*x+1/5-13/70 = 0
1/7*x+1/70 = 0 // - 1/70
1/7*x = -1/70 // : 1/7
x = -1/70/1/7
x = -1/10
x = -1/10
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