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4200x + 40(60-x) = 3000
4200x + 2400 - 40x = 3600
4160x = 3600 - 2400
4160x = 1200
x= 1200/4160
x = 600/2800
x= 300/1400
x= 150/700
x= 75/350
x= 13 /70