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3(-13)-(-12)=3
We simplify the equation to the form, which is simple to understand
3(-13)-(-12)=3
Reorder the terms in parentheses
+(-39)-(-12)=3
Remove unnecessary parentheses
-39-(-12+)=+3
Remove unnecessary parentheses
-39+12=3
We move all terms containing to the left and all other terms to the right.
0=+3+39-12
We simplify left and right side of the equation.
0=+30
0=30
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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