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19=7-(a+9)
We simplify the equation to the form, which is simple to understand
19=7-(a+9)
Remove unnecessary parentheses
19=7-1a-9
We move all terms containing a to the left and all other terms to the right.
+1a=+7-9-19
We simplify left and right side of the equation.
+1a=-21
We divide both sides of the equation by 01 to get a.
a=-21
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