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x in (-oo:+oo)
10.9 = x/4 // - x/4
10.9-(x/4) = 0
10.9-1/4*x = 0 // - 10.9
-1/4*x = -10.9 // : -1/4
x = -10.9/(-1/4)
x = 43.6
x = 43.6
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