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0.3x+35=0.2x+45
We move all terms to the left:
0.3x+35-(0.2x+45)=0
We get rid of parentheses
0.3x-0.2x-45+35=0
We add all the numbers together, and all the variables
0.1x-10=0
We move all terms containing x to the left, all other terms to the right
0.1x=10
x=10/0.1
x=100
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