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15-3x=20x+x
We move all terms to the left:
15-3x-(20x+x)=0
We add all the numbers together, and all the variables
-3x-(+21x)+15=0
We get rid of parentheses
-3x-21x+15=0
We add all the numbers together, and all the variables
-24x+15=0
We move all terms containing x to the left, all other terms to the right
-24x=-15
x=-15/-24
x=5/8
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