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.50x+0.45(50)=25.5
We move all terms to the left:
.50x+0.45(50)-(25.5)=0
We add all the numbers together, and all the variables
.50x-25.045=0
We move all terms containing x to the left, all other terms to the right
.50x=25.045
x=25.045/.50
x=50+0.045/.50
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