It is equal to 2x because if you were to replace the "x" with a number say, 2 for example so 2 + 2 would be 4 and 2 times 2 would also be 4 which is what "2x" stands for (2 times x). So then if you had x + x you would get 2x.
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x+x=2x
It equals x+5y simplified
6 + 2x =2(3 + x)
2x + 7 + 5x - 4 - x = (2x + 5x - x) + (7 - 4) = 6x + 3
If 4x - 2x + 4 = 10, the solution is 2x + 4 = 10 and x = 3.