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(1/5)*(x+750) = 350 // - 350
(1/5)*(x+750)-350 = 0
1/5*(x+750)-350 = 0
1/5*(x+750)-350 = 0
1/5*x-200 = 0
1/5*x-200 = 0
1/5*x-200 = 0 // + 200
1/5*x = 200 // : 1/5
x = 200/1/5
x = 1000
x = 1000
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