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7x-12=7x-7
We simplify the equation to the form, which is simple to understand
7x-12=7x-7
We move all terms containing x to the left and all other terms to the right.
+7x-7x=-7+12
We simplify left and right side of the equation.
0x=+5
0=5
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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