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21/3-42+72/3=0
We simplify the equation to the form, which is simple to understand
21/3-42+72/3=0
We move all terms containing to the left and all other terms to the right.
0=0-7+42-24
We simplify left and right side of the equation.
0=+11
0=11
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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