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250=40x+100
We move all terms to the left:
250-(40x+100)=0
We get rid of parentheses
-40x-100+250=0
We add all the numbers together, and all the variables
-40x+150=0
We move all terms containing x to the left, all other terms to the right
-40x=-150
x=-150/-40
x=3+3/4
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