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3(5+7)+9=-66
We simplify the equation to the form, which is simple to understand
3(5+7)+9=-66
Simplifying terms in parentheses
3*(+12)+9=-66
Reorder the terms in parentheses
+(+36)+9=-66
Remove unnecessary parentheses
+36+9=-66
We move all terms containing to the left and all other terms to the right.
0=-66-36-9
We simplify left and right side of the equation.
0=-111
0=-111
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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