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-9+4w-(-15)-6w-6+2w=0
We simplify the equation to the form, which is simple to understand
-9+4w-(-15)-6w-6+2w=0
Remove unnecessary parentheses
-9+4w+15-6w-6+2w=0
We move all terms containing w to the left and all other terms to the right.
+4w-6w+2w=0+9-15+6
We simplify left and right side of the equation.
w=0
0=0
This equation is an identity, so all real numbers are solutions.
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