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x in (-oo:+oo)
x-((1/2)*x)-4 = 1 // - 1
x-((1/2)*x)-4-1 = 0
x+(-1/2)*x-4-1 = 0
1/2*x-5 = 0 // + 5
1/2*x = 5 // : 1/2
x = 5/1/2
x = 10
x = 10
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