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x in (-oo:+oo)
7-(x/3) = 13-(x/6) // - 13-(x/6)
x/6-(x/3)-13+7 = 0
-1/6*x-6 = 0 // + 6
-1/6*x = 6 // : -1/6
x = 6/(-1/6)
x = -36
x = -36
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