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-3(7w)+7(3w)=0
We simplify the equation to the form, which is simple to understand
-3(7w)+7(3w)=0
Reorder the terms in parentheses
+(-21w)+7*(3w)=0
Remove unnecessary parentheses
-21w+7+*(+3w+)=0
Reorder the terms in parentheses
-21w+(+21w)=0
Remove unnecessary parentheses
-21w+21w=0
We move all terms containing w to the left and all other terms to the right.
-21w+21w=0
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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