Add the two equations you get 5y = 60 so y = 12 and x = 2
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4x+2y = 20 2y = -4x+20 y = -2x+10
4x + 2y = 20 2y = -4x + 20 y = -2x + 10.......but you may also write it as y = 10 - 2x.
y = -2x+10
y=16 x= -4
The result of the equation x + 2y - 2x - y equals x simplifies to y - x.