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4(4-1)+(-4)-7=0
We simplify the equation to the form, which is simple to understand
4(4-1)+(-4)-7=0
Reorder the terms in parentheses
+(+12)+(-4)-7=0
Remove unnecessary parentheses
+12+(-4+)-7=0
Remove unnecessary parentheses
+12-4-7=0
We move all terms containing to the left and all other terms to the right.
0=0-12+4+7
We simplify left and right side of the equation.
0=-1
0=-1
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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