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450 = x+(2/3)*x+x+(2/3)*x+50 // - x+(2/3)*x+x+(2/3)*x+50
450-x-((2/3)*x)-x-((2/3)*x)-50 = 0
(-2/3)*x-x-x+(-2/3)*x-50+450 = 0
400-10/3*x = 0 // - 400
-10/3*x = -400 // : -10/3
x = -400/(-10/3)
x = 120
x = 120
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