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400-x = (5*(350-x))/6 // - (5*(350-x))/6
400-((5*(350-x))/6)-x = 0
(-5/6)*(350-x)-x+400 = 0
400-5/6*(350-x)-x = 0
400-5/6*(350-x)-x = 0
400-1/6*x-875/3 = 0
325/3-1/6*x = 0
325/3-1/6*x = 0
325/3-1/6*x = 0 // - 325/3
-1/6*x = -325/3 // : -1/6
x = -325/3/(-1/6)
x = 650
x = 650
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