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x in (-oo:+oo)
2*x-((1/2)*x) = 15 // - 15
2*x-((1/2)*x)-15 = 0
2*x+(-1/2)*x-15 = 0
3/2*x-15 = 0 // + 15
3/2*x = 15 // : 3/2
x = 15/3/2
x = 10
x = 10
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