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-4(-6+a)=100
We move all terms to the left:
-4(-6+a)-(100)=0
We add all the numbers together, and all the variables
-4(a-6)-100=0
We multiply parentheses
-4a+24-100=0
We add all the numbers together, and all the variables
-4a-76=0
We move all terms containing a to the left, all other terms to the right
-4a=76
a=76/-4
a=-19
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