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a+(-4)=-19
We simplify the equation to the form, which is simple to understand
a+(-4)=-19
Remove unnecessary parentheses
+a-4=-19
We move all terms containing a to the left and all other terms to the right.
+1a=-19+4
We simplify left and right side of the equation.
+1a=-15
We divide both sides of the equation by 1 to get a.
a=-15
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