2x-21+x-21=90

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Solution for 2x-21+x-21=90 equation: 



2x-21+x-21=90

We move all terms to the left:

2x-21+x-21-(90)=0

We add all the numbers together, and all the variables

3x-132=0

We move all terms containing x to the left, all other terms to the right

3x=132

x=132/3

x=44

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