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18-(-15)-3-(-5)+2=0
We simplify the equation to the form, which is simple to understand
18-(-15)-3-(-5)+2=0
Remove unnecessary parentheses
18+15-3-(-5)+2=0
Remove unnecessary parentheses
18+15-3+5+2=0
We move all terms containing to the left and all other terms to the right.
0=0-18-15+3-5-2
We simplify left and right side of the equation.
0=-37
0=-37
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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