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x in (-oo:+oo)
x/3 = 6.2 // - 6.2
x/3-6.2 = 0
1/3*x-6.2 = 0 // + 6.2
1/3*x = 6.2 // : 1/3
x = 6.2/1/3
x = 18.60000019
x = 18.60000019
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