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x/5=90-x
We move all terms to the left:
x/5-(90-x)=0
We add all the numbers together, and all the variables
x/5-(-1x+90)=0
We get rid of parentheses
x/5+1x-90=0
We multiply all the terms by the denominator
x+1x*5-90*5=0
We add all the numbers together, and all the variables
x+1x*5-450=0
Wy multiply elements
x+5x-450=0
We add all the numbers together, and all the variables
6x-450=0
We move all terms containing x to the left, all other terms to the right
6x=450
x=450/6
x=75
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