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700=3x+250
We move all terms to the left:
700-(3x+250)=0
We get rid of parentheses
-3x-250+700=0
We add all the numbers together, and all the variables
-3x+450=0
We move all terms containing x to the left, all other terms to the right
-3x=-450
x=-450/-3
x=+150
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