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7a*2-a*2+16=0
We simplify the equation to the form, which is simple to understand
7a*2-a*2+16=0
We move all terms containing a to the left and all other terms to the right.
+14a-2a=0-16
We simplify left and right side of the equation.
+12a=-16
We divide both sides of the equation by 12 to get a.
a=-1.3333333333333
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