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6(4+a)=90
We move all terms to the left:
6(4+a)-(90)=0
We add all the numbers together, and all the variables
6(a+4)-90=0
We multiply parentheses
6a+24-90=0
We add all the numbers together, and all the variables
6a-66=0
We move all terms containing a to the left, all other terms to the right
6a=66
a=66/6
a=11
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