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