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x in (-oo:+oo)
(1/3)*(5-x) = 6 // - 6
(1/3)*(5-x)-6 = 0
1/3*(5-x)-6 = 0
1/3*(5-x)-6 = 0
-1/3*x-13/3 = 0
-1/3*x-13/3 = 0
-1/3*x-13/3 = 0 // + 13/3
-1/3*x = 13/3 // : -1/3
x = 13/3/(-1/3)
x = -13
x = -13
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