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x in (-oo:+oo)
5/7 = x/28 // - x/28
5/7-(x/28) = 0
5/7-1/28*x = 0 // - 5/7
-1/28*x = -5/7 // : -1/28
x = -5/7/(-1/28)
x = 20
x = 20
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