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x in (-oo:+oo)
(1/3)*x+13 = (5/7)*x-1 // - (5/7)*x-1
(1/3)*x-((5/7)*x)+1+13 = 0
(1/3)*x+(-5/7)*x+1+13 = 0
14-8/21*x = 0 // - 14
-8/21*x = -14 // : -8/21
x = -14/(-8/21)
x = 147/4
x = 147/4
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