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x in (-oo:+oo)
(2*x)/(-4)+6 = -4 // + 4
(2*x)/(-4)+4+6 = 0
10-1/2*x = 0 // - 10
-1/2*x = -10 // : -1/2
x = -10/(-1/2)
x = 20
x = 20
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