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20x-15x=60x+30x
We move all terms to the left:
20x-15x-(60x+30x)=0
We add all the numbers together, and all the variables
20x-15x-(+90x)=0
We add all the numbers together, and all the variables
5x-(+90x)=0
We get rid of parentheses
5x-90x=0
We add all the numbers together, and all the variables
-85x=0
x=0/-85
x=0
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