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x in (-oo:+oo)
11.2 = x/7 // - x/7
11.2-(x/7) = 0
11.2-1/7*x = 0 // - 11.2
-1/7*x = -11.2 // : -1/7
x = -11.2/(-1/7)
x = 78.40000157
x = 78.40000157
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