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x in (-oo:+oo)
3/7-(7*x) = (-1/2)*x+825/14 // - (-1/2)*x+825/14
3/7-(7*x)-((-1/2)*x)-(825/14) = 0
(1/2)*x-7*x+3/7-825/14 = 0
-13/2*x-117/2 = 0 // + 117/2
-13/2*x = 117/2 // : -13/2
x = 117/2/(-13/2)
x = -9
x = -9
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