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x in (-oo:+oo)
(2/7)*x-(1/14) = 0.5 // - 0.5
(2/7)*x-(1/14)-0.5 = 0
(2/7)*x-1/14-0.5 = 0
2/7*x-0.57142857 = 0 // + 0.57142857
2/7*x = 0.57142857 // : 2/7
x = 0.57142857/2/7
x = 1.99999997
x = 1.99999997
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