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4x=12x-15-8x
We simplify the equation to the form, which is simple to understand
4x=12x-15-8x
We move all terms containing x to the left and all other terms to the right.
+4x-12x+8x=-15
We simplify left and right side of the equation.
0x=-15
0=-15
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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