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x in (-oo:+oo)
7 = x/22.4 // - x/22.4
7-(x/22.4) = 0
7-0.04464286*x = 0
7-0.04464286*x = 0 // - 7
-0.04464286*x = -7 // : -0.04464286
x = -7/(-0.04464286)
x = 156.79998996
x = 156.79998996
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