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x in (-oo:+oo)
7/4 = x/56 // - x/56
7/4-(x/56) = 0
7/4-1/56*x = 0 // - 7/4
-1/56*x = -7/4 // : -1/56
x = -7/4/(-1/56)
x = 98
x = 98
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