Question 855836
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Hi,
3y-x=5   &#8658;  x = {{{green(3y-5)}}} 
4y+2x=40
4y+2({{{green(3y-5)}}})=40
4y + 6y - 10 = 40
    10y = 50
      y = 5
      x = {{{green(3y-5) = 10}}} 
CHECKING our answer***
Using 3y-x = 5
    15-10 = 5
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