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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
12/35*x-7/15 = 0 // + 7/15
12/35*x = 7/15 // : 12/35
x = 7/15/12/35
x = 49/36
x = 49/36
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