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x in (-oo:+oo)
3*(1/2)*x = 28 // - 28
3*(1/2)*x-28 = 0
3/2*x-28 = 0 // + 28
3/2*x = 28 // : 3/2
x = 28/3/2
x = 56/3
x = 56/3
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