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20-((1/3)*x) = 72 // - 72
20-((1/3)*x)-72 = 0
(-1/3)*x-72+20 = 0
-1/3*x-52 = 0 // + 52
-1/3*x = 52 // : -1/3
x = 52/(-1/3)
x = -156
x = -156
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