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x in (-oo:+oo)
(1/7)*x+7 = 193/28 // - 193/28
(1/7)*x-(193/28)+7 = 0
(1/7)*x-193/28+7 = 0
1/7*x+3/28 = 0 // - 3/28
1/7*x = -3/28 // : 1/7
x = -3/28/1/7
x = -3/4
x = -3/4
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