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40+14a=2(-4a-13)
We move all terms to the left:
40+14a-(2(-4a-13))=0
We calculate terms in parentheses: -(2(-4a-13)), so:We get rid of parentheses
2(-4a-13)
We multiply parentheses
-8a-26
Back to the equation:
-(-8a-26)
14a+8a+26+40=0
We add all the numbers together, and all the variables
22a+66=0
We move all terms containing a to the left, all other terms to the right
22a=-66
a=-66/22
a=-3
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