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x in (-oo:+oo)
(-2/5)*x = -12.4 // + 12.4
(-2/5)*x+12.4 = 0
12.4-2/5*x = 0 // - 12.4
-2/5*x = -12.4 // : -2/5
x = -12.4/(-2/5)
x = 31
x = 31
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