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x+(1/3)*x+3*x-60-40+20 = 180 // - 180
x+(1/3)*x+3*x-180-60-40+20 = 0
13/3*x-260 = 0 // + 260
13/3*x = 260 // : 13/3
x = 260/13/3
x = 60
x = 60
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