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-9+(-15)+x=8-5-12
We simplify the equation to the form, which is simple to understand
-9+(-15)+x=8-5-12
Remove unnecessary parentheses
-9-15+x=+8-5-12
We move all terms containing x to the left and all other terms to the right.
+1x=+8-5-12+9+15
We simplify left and right side of the equation.
+1x=+15
We divide both sides of the equation by 1 to get x.
x=15
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