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4x+12=5x+9-x+3
We simplify the equation to the form, which is simple to understand
4x+12=5x+9-x+3
We move all terms containing x to the left and all other terms to the right.
+4x-5x+1x=+9+3-12
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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