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21.50x=18x+70
We move all terms to the left:
21.50x-(18x+70)=0
We get rid of parentheses
21.50x-18x-70=0
We add all the numbers together, and all the variables
3.5x-70=0
We move all terms containing x to the left, all other terms to the right
3.5x=70
x=70/3.5
x=20
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