It depends on the value of x: This is just an expression, not an equation or a formula (the clue is there is 1 more variable (1) than there are equals signs (0)).
2x just means multiply by 2 though, so whatever x is, multiply by 2 then add 6. That's your answer!
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6 + 2x =2(3 + x)
-2x + 6 <= 4x + 18 -2x <= 4x + 12 -12 <= 6x -2 <= x
The equation 2x + 3 = 2x + 6 cannot be solved due to the "variable" cancelling itself out by moving to either side of the equal sign.
X can't be solved, you don't have anything on the right side of the equal.
2x must equal 12 so x is 6.