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(1/3)*(15*x+975) = 4000 // - 4000
(1/3)*(15*x+975)-4000 = 0
1/3*(15*x+975)-4000 = 0
1/3*(15*x+975)-4000 = 0
5*x-3675 = 0
5*x-3675 = 0
5*x-3675 = 0 // + 3675
5*x = 3675 // : 5
x = 3675/5
x = 735
x = 735
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