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x in (-oo:+oo)
x/3 = 19.3 // - 19.3
x/3-19.3 = 0
1/3*x-19.3 = 0 // + 19.3
1/3*x = 19.3 // : 1/3
x = 19.3/1/3
x = 57.90000058
x = 57.90000058
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