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