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(1/3)*x+100/3 = 500 // - 500
(1/3)*x+100/3-500 = 0
1/3*x-1400/3 = 0 // + 1400/3
1/3*x = 1400/3 // : 1/3
x = 1400/3/1/3
x = 1400
x = 1400
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