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21x+9=18x+15+3x
We simplify the equation to the form, which is simple to understand
21x+9=18x+15+3x
We move all terms containing x to the left and all other terms to the right.
+21x-18x-3x=+15-9
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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