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-3(a+2)-5(a-1)=-10(9-1)+1
We move all terms to the left:
-3(a+2)-5(a-1)-(-10(9-1)+1)=0
We add all the numbers together, and all the variables
-3(a+2)-5(a-1)-(-108+1)=0
We add all the numbers together, and all the variables
-3(a+2)-5(a-1)+107=0
We multiply parentheses
-3a-5a-6+5+107=0
We add all the numbers together, and all the variables
-8a+106=0
We move all terms containing a to the left, all other terms to the right
-8a=-106
a=-106/-8
a=13+1/4
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