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x in (-oo:+oo)
6/7 = x/49 // - x/49
6/7-(x/49) = 0
6/7-1/49*x = 0 // - 6/7
-1/49*x = -6/7 // : -1/49
x = -6/7/(-1/49)
x = 42
x = 42
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