x-6+x-12=90

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Solution for x-6+x-12=90 equation: 



x-6+x-12=90

We move all terms to the left:

x-6+x-12-(90)=0

We add all the numbers together, and all the variables

2x-108=0

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

2x=108

x=108/2

x=54

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