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x in (-oo:+oo)
x/5 = 2.5 // - 2.5
x/5-2.5 = 0
1/5*x-2.5 = 0 // + 2.5
1/5*x = 2.5 // : 1/5
x = 2.5/1/5
x = 12.5
x = 12.5
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