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3x+3=3x+9
We simplify the equation to the form, which is simple to understand
3x+3=3x+9
We move all terms containing x to the left and all other terms to the right.
+3x-3x=+9-3
We simplify left and right side of the equation.
0x=+6
0=6
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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