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x in (-oo:+oo)
5.5/7 = x/4 // - x/4
5.5/7-(x/4) = 0
0.78571429-1/4*x = 0 // - 0.78571429
-1/4*x = -0.78571429 // : -1/4
x = -0.78571429/(-1/4)
x = 3.14285716
x = 3.14285716
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