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x in (-oo:+oo)
2*x+1/7 = 4*x // - 4*x
2*x-(4*x)+1/7 = 0
2*x-4*x+1/7 = 0
1/7-2*x = 0 // - 1/7
-2*x = -1/7 // : -2
x = -1/7/(-2)
x = 1/14
x = 1/14
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