It appears to be a simple linear equation in 'x'.
But it has no solution. There is no numerical value for 'x'
that can make it a true statement.
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If your question was 2X + 5 =10. X equals what? Then X=2.5
2x+x-5 = 10 2x+x = 10+5 3x = 15 x = 5 and y = 0
Add 5 to each side getting 2x = -10, so x = -5
10-2y
if it is -X then X=5 if it was minus X the X=10