(1/2x4 - 5x3) * [( 7x5-4x) - ( x3 + x) : ( x2 + 1)]

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

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Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28