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2.1(7-3(2))=x
We move all terms to the left:
2.1(7-3(2))-(x)=0
We add all the numbers together, and all the variables
-x+2.1(-25)=0
We add all the numbers together, and all the variables
-1x-52.5=0
We move all terms containing x to the left, all other terms to the right
-x=52.5
x=52.5/-1
x=-52+0.5/1
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