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