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8(a+7)=7(a+8)-7
We move all terms to the left:
8(a+7)-(7(a+8)-7)=0
We multiply parentheses
8a-(7(a+8)-7)+56=0
We calculate terms in parentheses: -(7(a+8)-7), so:We get rid of parentheses
7(a+8)-7
We multiply parentheses
7a+56-7
We add all the numbers together, and all the variables
7a+49
Back to the equation:
-(7a+49)
8a-7a-49+56=0
We add all the numbers together, and all the variables
a+7=0
We move all terms containing a to the left, all other terms to the right
a=-7
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