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25x+90=20x+100
We move all terms to the left:
25x+90-(20x+100)=0
We get rid of parentheses
25x-20x-100+90=0
We add all the numbers together, and all the variables
5x-10=0
We move all terms containing x to the left, all other terms to the right
5x=10
x=10/5
x=2
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