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x in (-oo:+oo)
x-((1/2)*x) = 30 // - 30
x-((1/2)*x)-30 = 0
x+(-1/2)*x-30 = 0
1/2*x-30 = 0 // + 30
1/2*x = 30 // : 1/2
x = 30/1/2
x = 60
x = 60
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