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x in (-oo:+oo)
5*x-(2/4) = 3 // - 3
5*x-(2/4)-3 = 0
5*x-1/2-3 = 0
5*x-7/2 = 0 // + 7/2
5*x = 7/2 // : 5
x = 7/2/5
x = 7/10
x = 7/10
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