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x in (-oo:+oo)
2*x+20/7 = 4*x+6 // - 4*x+6
2*x-(4*x)+20/7-6 = 0
2*x-4*x+20/7-6 = 0
-2*x-22/7 = 0 // + 22/7
-2*x = 22/7 // : -2
x = 22/7/(-2)
x = -11/7
x = -11/7
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