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9x-9=9(x+7)
We simplify the equation to the form, which is simple to understand
9x-9=9(x+7)
Reorder the terms in parentheses
9x-9=+(+9x+63)
Remove unnecessary parentheses
+9x-9=+9x+63
We move all terms containing x to the left and all other terms to the right.
+9x-9x=+63+9
We simplify left and right side of the equation.
0x=+72
0=72
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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