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x in (-oo:+oo)
x/5 = 2.3 // - 2.3
x/5-2.3 = 0
1/5*x-2.3 = 0 // + 2.3
1/5*x = 2.3 // : 1/5
x = 2.3/1/5
x = 11.5
x = 11.5
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