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-30-5a=2(-7-a)+5
We move all terms to the left:
-30-5a-(2(-7-a)+5)=0
We add all the numbers together, and all the variables
-5a-(2(-1a-7)+5)-30=0
We calculate terms in parentheses: -(2(-1a-7)+5), so:We get rid of parentheses
2(-1a-7)+5
We multiply parentheses
-2a-14+5
We add all the numbers together, and all the variables
-2a-9
Back to the equation:
-(-2a-9)
-5a+2a+9-30=0
We add all the numbers together, and all the variables
-3a-21=0
We move all terms containing a to the left, all other terms to the right
-3a=21
a=21/-3
a=-7
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