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100=3x+10
We move all terms to the left:
100-(3x+10)=0
We get rid of parentheses
-3x-10+100=0
We add all the numbers together, and all the variables
-3x+90=0
We move all terms containing x to the left, all other terms to the right
-3x=-90
x=-90/-3
x=+30
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