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x=30-15+0.25x
We move all terms to the left:
x-(30-15+0.25x)=0
We add all the numbers together, and all the variables
x-(0.25x+15)=0
We get rid of parentheses
x-0.25x-15=0
We add all the numbers together, and all the variables
0.75x-15=0
We move all terms containing x to the left, all other terms to the right
0.75x=15
x=15/0.75
x=20
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