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x in (-oo:+oo)
3*x+(6/3)*x = 0.5 // - 0.5
3*x+(6/3)*x-0.5 = 0
5*x-0.5 = 0 // + 0.5
5*x = 0.5 // : 5
x = 0.5/5
x = 0.1
x = 0.1
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