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250=5x+50
We move all terms to the left:
250-(5x+50)=0
We get rid of parentheses
-5x-50+250=0
We add all the numbers together, and all the variables
-5x+200=0
We move all terms containing x to the left, all other terms to the right
-5x=-200
x=-200/-5
x=+40
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