It's one of the simplest linear equations in 'x' that can be written.
Its solution is [ x = -5 ].
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x=5
If: x+10 = 15 then x = 5
If your question was 2X + 5 =10. X equals what? Then X=2.5
x = -10
2x+x-5 = 10 2x+x = 10+5 3x = 15 x = 5 and y = 0