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21-3/12-3=0
We simplify the equation to the form, which is simple to understand
21-3/12-3=0
Simplifying:
21-0.25-3=0
We move all terms containing to the left and all other terms to the right.
0=0-21 + 0.25+3
We simplify left and right side of the equation.
0=-17.75
0=-17.75
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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