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x in (-oo:+oo)
(1/2)*x-(4/7) = (-6/7)*x-(53/126) // - (-6/7)*x-(53/126)
(1/2)*x-((-6/7)*x)-(4/7)+53/126 = 0
(1/2)*x+(6/7)*x-4/7+53/126 = 0
19/14*x-19/126 = 0 // + 19/126
19/14*x = 19/126 // : 19/14
x = 19/126/19/14
x = 1/9
x = 1/9
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