+18+12x=90

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Solution for +18+12x=90 equation: 



+18+12x=90

We move all terms to the left:

+18+12x-(90)=0

We add all the numbers together, and all the variables

12x-72=0

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

12x=72

x=72/12

x=6

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