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0.55x+15=0.40x+30
We move all terms to the left:
0.55x+15-(0.40x+30)=0
We get rid of parentheses
0.55x-0.40x-30+15=0
We add all the numbers together, and all the variables
0.15x-15=0
We move all terms containing x to the left, all other terms to the right
0.15x=15
x=15/0.15
x=100
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