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20+5.50x=15+6.50x
We move all terms to the left:
20+5.50x-(15+6.50x)=0
We add all the numbers together, and all the variables
5.50x-(6.50x+15)+20=0
We get rid of parentheses
5.50x-6.50x-15+20=0
We add all the numbers together, and all the variables
-1x+5=0
We move all terms containing x to the left, all other terms to the right
-x=-5
x=-5/-1
x=+5
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