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x in (-oo:+oo)
x+(1/2)*x = 16.2 // - 16.2
x+(1/2)*x-16.2 = 0
3/2*x-16.2 = 0 // + 16.2
3/2*x = 16.2 // : 3/2
x = 16.2/3/2
x = 10.8
x = 10.8
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