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x in (-oo:+oo)
7.7/15.4 = x/2.2 // - x/2.2
7.7/15.4-(x/2.2) = 0
7.7/15.4-0.45454545*x = 0
0.5-0.45454545*x = 0 // - 0.5
-0.45454545*x = -0.5 // : -0.45454545
x = -0.5/(-0.45454545)
x = 1.10000001
x = 1.10000001
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