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-8a+3(1-7a)=-171
We move all terms to the left:
-8a+3(1-7a)-(-171)=0
We add all the numbers together, and all the variables
-8a+3(-7a+1)-(-171)=0
We add all the numbers together, and all the variables
-8a+3(-7a+1)+171=0
We multiply parentheses
-8a-21a+3+171=0
We add all the numbers together, and all the variables
-29a+174=0
We move all terms containing a to the left, all other terms to the right
-29a=-174
a=-174/-29
a=+6
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