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5x+15=5x-6
We simplify the equation to the form, which is simple to understand
5x+15=5x-6
We move all terms containing x to the left and all other terms to the right.
+5x-5x=-6-15
We simplify left and right side of the equation.
0x=-21
0=-21
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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