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