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x in (-oo:+oo)
4*x-(1/2) = 10 // - 10
4*x-(1/2)-10 = 0
4*x-1/2-10 = 0
4*x-21/2 = 0 // + 21/2
4*x = 21/2 // : 4
x = 21/2/4
x = 21/8
x = 21/8
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