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x in (-oo:+oo)
10/8 = x/7 // - x/7
10/8-(x/7) = 0
5/4-1/7*x = 0 // - 5/4
-1/7*x = -5/4 // : -1/7
x = -5/4/(-1/7)
x = 35/4
x = 35/4
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