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-7-4(2-1)=21
We simplify the equation to the form, which is simple to understand
-7-4(2-1)=21
Simplifying terms in parentheses
-7-4*(+1)=21
Reorder the terms in parentheses
-7+(-4)=21
Remove unnecessary parentheses
-7-4=+21
We move all terms containing to the left and all other terms to the right.
0=+21+7+4
We simplify left and right side of the equation.
0=+32
0=32
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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