12+(13x)=90

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Solution for 12+(13x)=90 equation: 



12+(13x)=90

We move all terms to the left:

12+(13x)-(90)=0

We add all the numbers together, and all the variables

13x-78=0

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

13x=78

x=78/13

x=6

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