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(x-2/5)*(1/2) = 0.23
x/2 - 2/10 = 0.23
x/2 = .23 + 2/10
x/2 = 2.3/10 + 2/10 ( convertimo a fraccion decimal .23)
x/2 = 4.3/10
x = 2(4.3)/10
x= 8.6/10
x= .86