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2+3+6+7+5+a+3=25
We simplify the equation to the form, which is simple to understand
2+3+6+7+5+a+3=25
We move all terms containing a to the left and all other terms to the right.
+1a=+25-2-3-6-7-5-3
We simplify left and right side of the equation.
+1a=-1
We divide both sides of the equation by 1 to get a.
a=-1
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