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-6(1+4a)=90
We move all terms to the left:
-6(1+4a)-(90)=0
We add all the numbers together, and all the variables
-6(4a+1)-90=0
We multiply parentheses
-24a-6-90=0
We add all the numbers together, and all the variables
-24a-96=0
We move all terms containing a to the left, all other terms to the right
-24a=96
a=96/-24
a=-4
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