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9(1)+7(-7)=0
We simplify the equation to the form, which is simple to understand
9(1)+7(-7)=0
Reorder the terms in parentheses
+(+9)+7*(-7)=0
Remove unnecessary parentheses
+9+7+*(-7+)=0
Reorder the terms in parentheses
+9+(-49)=0
Remove unnecessary parentheses
+9-49=0
We move all terms containing to the left and all other terms to the right.
0=0-9+49
We simplify left and right side of the equation.
0=+40
0=40
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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