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x in (-oo:+oo)
(1/5)*x-((1/7)*x) = 7/15 // - 7/15
(1/5)*x-((1/7)*x)-(7/15) = 0
(1/5)*x+(-1/7)*x-7/15 = 0
2/35*x-7/15 = 0 // + 7/15
2/35*x = 7/15 // : 2/35
x = 7/15/2/35
x = 49/6
x = 49/6
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