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-3(1+5a)-2a=-71
We move all terms to the left:
-3(1+5a)-2a-(-71)=0
We add all the numbers together, and all the variables
-3(5a+1)-2a-(-71)=0
We add all the numbers together, and all the variables
-2a-3(5a+1)+71=0
We multiply parentheses
-2a-15a-3+71=0
We add all the numbers together, and all the variables
-17a+68=0
We move all terms containing a to the left, all other terms to the right
-17a=-68
a=-68/-17
a=+4
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