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x in (-oo:+oo)
x-x-(2/3)-(8/4) = 7*x-(2/6) // - 7*x-(2/6)
x-x-(7*x)-(2/3)-(8/4)+2/6 = 0
x-x-7*x-2/3+2/6-2 = 0
-7*x-7/3 = 0 // + 7/3
-7*x = 7/3 // : -7
x = 7/3/(-7)
x = -1/3
x = -1/3
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