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x in (-oo:+oo)
1/7-(2*x) = 43/7-x // - 43/7-x
x-(2*x)+1/7-(43/7) = 0
x-2*x+1/7-43/7 = 0
-x-6 = 0 // + 6
-x = 6 // * -1
x = -6
x = -6
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