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x in (-oo:+oo)
(4/7)*x = 4/49 // - 4/49
(4/7)*x-(4/49) = 0
(4/7)*x-4/49 = 0
4/7*x-4/49 = 0 // + 4/49
4/7*x = 4/49 // : 4/7
x = 4/49/4/7
x = 1/7
x = 1/7
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