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x in (-oo:+oo)
(-1/2)*x = 4/7 // - 4/7
(-1/2)*x-(4/7) = 0
(-1/2)*x-4/7 = 0
-1/2*x-4/7 = 0 // + 4/7
-1/2*x = 4/7 // : -1/2
x = 4/7/(-1/2)
x = -8/7
x = -8/7
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