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13 - 9 + 5 = 4
We simplify the equation to the form, which is simple to understand
13-9+5=4
We move all terms containing to the left and all other terms to the right.
0=+4-13+9-5
We simplify left and right side of the equation.
0=-5
0=-5
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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