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x in (-oo:+oo)
2.4 = x/5 // - x/5
2.4-(x/5) = 0
2.4-1/5*x = 0 // - 2.4
-1/5*x = -2.4 // : -1/5
x = -2.4/(-1/5)
x = 12
x = 12
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