book Maths Puzzle Numerical Ability

In science lab, devin and his classmates are asked to determine how many grams of hydrogen and how many grams of oxygen are in 477 grams of water. Devin used what he learned in cla

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y=x+1
y=-2x-4 please help?????? this is a practice problem for a placement test for college. I have the answer but I dont understand how they got it. Help Please! 7x-8(y-x)+3y= 5(3x-y)