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-7x+13+8x=4+x+9
We simplify the equation to the form, which is simple to understand
-7x+13+8x=4+x+9
We move all terms containing x to the left and all other terms to the right.
-7x+8x-1x=+4+9-13
We simplify left and right side of the equation.
0x=0
0=0
This equation is an identity, so all real numbers are solutions.
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