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x in (-oo:+oo)
4/7-((1/2)*x) = 2 // - 2
4/7-((1/2)*x)-2 = 0
(-1/2)*x+4/7-2 = 0
-1/2*x-10/7 = 0 // + 10/7
-1/2*x = 10/7 // : -1/2
x = 10/7/(-1/2)
x = -20/7
x = -20/7
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