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0.50x+0.35(30)=21.5
We move all terms to the left:
0.50x+0.35(30)-(21.5)=0
We add all the numbers together, and all the variables
0.50x-21.147=0
We move all terms containing x to the left, all other terms to the right
0.50x=21.147
x=21.147/0.50
x=42+0.147/0.50
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