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x in (-oo:+oo)
x/4-(1/2) = 2/5 // - 2/5
x/4-(1/2)-(2/5) = 0
x/4-1/2-2/5 = 0
1/4*x-9/10 = 0 // + 9/10
1/4*x = 9/10 // : 1/4
x = 9/10/1/4
x = 18/5
x = 18/5
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