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0.10x+30=0.15x+20
We move all terms to the left:
0.10x+30-(0.15x+20)=0
We get rid of parentheses
0.10x-0.15x-20+30=0
We add all the numbers together, and all the variables
-0.05x+10=0
We move all terms containing x to the left, all other terms to the right
-0.05x=-10
x=-10/-0.05
x=+200
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