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x in (-oo:+oo)
(4*x)/7 = 7*28 // - 7*28
(4*x)/7-(7*28) = 0
(4*x)/7-196 = 0
4/7*x-196 = 0 // + 196
4/7*x = 196 // : 4/7
x = 196/4/7
x = 343
x = 343
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