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45x+10=75x-20
We move all terms to the left:
45x+10-(75x-20)=0
We get rid of parentheses
45x-75x+20+10=0
We add all the numbers together, and all the variables
-30x+30=0
We move all terms containing x to the left, all other terms to the right
-30x=-30
x=-30/-30
x=1
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