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