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x in (-oo:+oo)
4/7 = x/49 // - x/49
4/7-(x/49) = 0
4/7-1/49*x = 0 // - 4/7
-1/49*x = -4/7 // : -1/49
x = -4/7/(-1/49)
x = 28
x = 28
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