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15x-5-8x-4=7x-13
We simplify the equation to the form, which is simple to understand
15x-5-8x-4=7x-13
We move all terms containing x to the left and all other terms to the right.
+15x-8x-7x=-13+5+4
We simplify left and right side of the equation.
0x=-4
0=-4
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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