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100=3.14*25x
We move all terms to the left:
100-(3.14*25x)=0
We add all the numbers together, and all the variables
-(+3.14*25x)+100=0
We get rid of parentheses
-3.14*25x+100=0
We move all terms containing x to the left, all other terms to the right
-3.14*25x=-100
x=-100/1
x=-100
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