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x+9=(27-x)-(18-2x)
We simplify the equation to the form, which is simple to understand
x+9=(27-x)-(18-2x)
Remove unnecessary parentheses
x+9=27-x-(18-2x)
Remove unnecessary parentheses
x+9=27-x-18+2x
We move all terms containing x to the left and all other terms to the right.
+1x+1x-2x=+27-18-9
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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