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x in (-oo:+oo)
x-(3*x)-2/7 = 152/7 // - 152/7
x-(3*x)-2/7-(152/7) = 0
x-3*x-2/7-152/7 = 0
-2*x-22 = 0 // + 22
-2*x = 22 // : -2
x = 22/(-2)
x = -11
x = -11
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