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400+25x=100+35x
We move all terms to the left:
400+25x-(100+35x)=0
We add all the numbers together, and all the variables
25x-(35x+100)+400=0
We get rid of parentheses
25x-35x-100+400=0
We add all the numbers together, and all the variables
-10x+300=0
We move all terms containing x to the left, all other terms to the right
-10x=-300
x=-300/-10
x=+30
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