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8(5-2a)+a=100
We move all terms to the left:
8(5-2a)+a-(100)=0
We add all the numbers together, and all the variables
8(-2a+5)+a-100=0
We add all the numbers together, and all the variables
a+8(-2a+5)-100=0
We multiply parentheses
a-16a+40-100=0
We add all the numbers together, and all the variables
-15a-60=0
We move all terms containing a to the left, all other terms to the right
-15a=60
a=60/-15
a=-4
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