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