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10=20-1.25x
We move all terms to the left:
10-(20-1.25x)=0
We add all the numbers together, and all the variables
-(-1.25x+20)+10=0
We get rid of parentheses
1.25x-20+10=0
We add all the numbers together, and all the variables
1.25x-10=0
We move all terms containing x to the left, all other terms to the right
1.25x=10
x=10/1.25
x=8
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