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(10x+21)=90
We move all terms to the left:
(10x+21)-(90)=0
We get rid of parentheses
10x+21-90=0
We add all the numbers together, and all the variables
10x-69=0
We move all terms containing x to the left, all other terms to the right
10x=69
x=69/10
x=6+9/10
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