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9x+72=9x+8
We simplify the equation to the form, which is simple to understand
9x+72=9x+8
We move all terms containing x to the left and all other terms to the right.
+9x-9x=+8-72
We simplify left and right side of the equation.
0x=-64
0=-64
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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