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(1/3)*x+x+x-25-15 = 320 // - 320
(1/3)*x+x+x-320-25-15 = 0
7/3*x-360 = 0 // + 360
7/3*x = 360 // : 7/3
x = 360/7/3
x = 1080/7
x = 1080/7
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