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-10-5+a-4=0
We simplify the equation to the form, which is simple to understand
-10-5+a-4=0
We move all terms containing a to the left and all other terms to the right.
+1a=0+10+5+4
We simplify left and right side of the equation.
+1a=+19
We divide both sides of the equation by 1 to get a.
a=19
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