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x in (-oo:+oo)
x/5-3 = 3/10 // - 3/10
x/5-(3/10)-3 = 0
x/5-3/10-3 = 0
1/5*x-33/10 = 0 // + 33/10
1/5*x = 33/10 // : 1/5
x = 33/10/1/5
x = 33/2
x = 33/2
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