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100+0.30x=+0.50x
We move all terms to the left:
100+0.30x-(+0.50x)=0
We get rid of parentheses
0.30x-0.50x+100=0
We add all the numbers together, and all the variables
-0.2x+100=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-100
x=-100/-0.2
x=+500
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