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(13)(-7)=0
We simplify the equation to the form, which is simple to understand
(13)*(-7)=0
Reorder the terms in parentheses
multiplication of parentheses
(-91)=0
Remove unnecessary parentheses
-91=0
We move all terms containing to the left and all other terms to the right.
0=0+91
We simplify left and right side of the equation.
0=+91
0=91
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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