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x in (-oo:+oo)
19.2 = x/3 // - x/3
19.2-(x/3) = 0
19.2-1/3*x = 0 // - 19.2
-1/3*x = -19.2 // : -1/3
x = -19.2/(-1/3)
x = 57.60000058
x = 57.60000058
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