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x in (-oo:+oo)
5.12 = x/4 // - x/4
5.12-(x/4) = 0
5.12-1/4*x = 0 // - 5.12
-1/4*x = -5.12 // : -1/4
x = -5.12/(-1/4)
x = 20.48
x = 20.48
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