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x in (-oo:+oo)
x-(2*x)-7 = -54/7 // + -54/7
x-(2*x)-(-54/7)-7 = 0
x-2*x+54/7-7 = 0
5/7-x = 0 // - 5/7
-x = -5/7 // * -1
x = 5/7
x = 5/7
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