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(1/3)*(1-x)+4 = 0
1/3*(1-x)+4 = 0
1/3*(1-x)+4 = 0
13/3-1/3*x = 0
13/3-1/3*x = 0
13/3-1/3*x = 0 // - 13/3
-1/3*x = -13/3 // : -1/3
x = -13/3/(-1/3)
x = 13
x = 13
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