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100=-4A+10
We move all terms to the left:
100-(-4A+10)=0
We get rid of parentheses
4A-10+100=0
We add all the numbers together, and all the variables
4A+90=0
We move all terms containing A to the left, all other terms to the right
4A=-90
A=-90/4
A=-22+1/2
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