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4=(-1)+4
We simplify the equation to the form, which is simple to understand
4=(-1)+4
Remove unnecessary parentheses
4=-1+4
We move all terms containing to the left and all other terms to the right.
0=-1+4-4
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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