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72+4x/5=90
We move all terms to the left:
72+4x/5-(90)=0
We add all the numbers together, and all the variables
4x/5-18=0
We multiply all the terms by the denominator
4x-18*5=0
We add all the numbers together, and all the variables
4x-90=0
We move all terms containing x to the left, all other terms to the right
4x=90
x=90/4
x=22+1/2
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