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0.3x+45=0.2x+50
We move all terms to the left:
0.3x+45-(0.2x+50)=0
We get rid of parentheses
0.3x-0.2x-50+45=0
We add all the numbers together, and all the variables
0.1x-5=0
We move all terms containing x to the left, all other terms to the right
0.1x=5
x=5/0.1
x=50
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