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x in (-oo:+oo)
x/3 = 5.5 // - 5.5
x/3-5.5 = 0
1/3*x-5.5 = 0 // + 5.5
1/3*x = 5.5 // : 1/3
x = 5.5/1/3
x = 16.50000017
x = 16.50000017
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