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x in (-oo:+oo)
x/3-((7*x)/13) = 2/3 // - 2/3
x/3-((7*x)/13)-(2/3) = 0
x/3+(-7/13)*x-2/3 = 0
-8/39*x-2/3 = 0 // + 2/3
-8/39*x = 2/3 // : -8/39
x = 2/3/(-8/39)
x = -13/4
x = -13/4
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