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16+8a=-8(a-7)+8
We move all terms to the left:
16+8a-(-8(a-7)+8)=0
We calculate terms in parentheses: -(-8(a-7)+8), so:We get rid of parentheses
-8(a-7)+8
We multiply parentheses
-8a+56+8
We add all the numbers together, and all the variables
-8a+64
Back to the equation:
-(-8a+64)
8a+8a-64+16=0
We add all the numbers together, and all the variables
16a-48=0
We move all terms containing a to the left, all other terms to the right
16a=48
a=48/16
a=3
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