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72+(x+4)=90
We move all terms to the left:
72+(x+4)-(90)=0
We add all the numbers together, and all the variables
(x+4)-18=0
We get rid of parentheses
x+4-18=0
We add all the numbers together, and all the variables
x-14=0
We move all terms containing x to the left, all other terms to the right
x=14
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