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(1/3)*(x+100) = 350 // - 350
(1/3)*(x+100)-350 = 0
1/3*(x+100)-350 = 0
1/3*(x+100)-350 = 0
1/3*x-950/3 = 0
1/3*x-950/3 = 0
1/3*x-950/3 = 0 // + 950/3
1/3*x = 950/3 // : 1/3
x = 950/3/1/3
x = 950
x = 950
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