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250=1.5x+x
We move all terms to the left:
250-(1.5x+x)=0
We add all the numbers together, and all the variables
-(+2.5x)+250=0
We get rid of parentheses
-2.5x+250=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-250
x=-250/-2.5
x=+100
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