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