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x in (-oo:+oo)
-x/7 = -2/3 // + -2/3
-x/7-(-2/3) = 0
2/3-x/7 = 0
2/3-1/7*x = 0 // - 2/3
-1/7*x = -2/3 // : -1/7
x = -2/3/(-1/7)
x = 14/3
x = 14/3
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