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x-(x*0.25)=90
We move all terms to the left:
x-(x*0.25)-(90)=0
We add all the numbers together, and all the variables
x-(+x*0.25)-90=0
We get rid of parentheses
x-x*0.25-90=0
Wy multiply elements
x-0.25x-90=0
We add all the numbers together, and all the variables
0.75x-90=0
We move all terms containing x to the left, all other terms to the right
0.75x=90
x=90/0.75
x=120
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