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x+(x+90)/4=90
We move all terms to the left:
x+(x+90)/4-(90)=0
We multiply all the terms by the denominator
x*4+(x+90)-90*4=0
We add all the numbers together, and all the variables
x*4+(x+90)-360=0
Wy multiply elements
4x+(x+90)-360=0
We get rid of parentheses
4x+x+90-360=0
We add all the numbers together, and all the variables
5x-270=0
We move all terms containing x to the left, all other terms to the right
5x=270
x=270/5
x=54
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