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X-(.12X)=521
We move all terms to the left:
X-(.12X)-(521)=0
We add all the numbers together, and all the variables
X-(+.12X)-521=0
We get rid of parentheses
X-.12X-521=0
We add all the numbers together, and all the variables
0.88X-521=0
We move all terms containing X to the left, all other terms to the right
0.88X=521
X=521/0.88
X=592+0.039999999999964/0.88
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