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4=a+(-19)
We simplify the equation to the form, which is simple to understand
4=a+(-19)
Remove unnecessary parentheses
+4=+a-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=-23
We divide both sides of the equation by -01 to get a.
a=23
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