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0.40x+30=0.30x+50
We move all terms to the left:
0.40x+30-(0.30x+50)=0
We get rid of parentheses
0.40x-0.30x-50+30=0
We add all the numbers together, and all the variables
0.1x-20=0
We move all terms containing x to the left, all other terms to the right
0.1x=20
x=20/0.1
x=200
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