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x in (-oo:+oo)
0.42 = x/5 // - x/5
0.42-(x/5) = 0
0.42-1/5*x = 0 // - 0.42
-1/5*x = -0.42 // : -1/5
x = -0.42/(-1/5)
x = 2.1
x = 2.1
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