54+12x=90

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Solution for 54+12x=90 equation: 



54+12x=90

We move all terms to the left:

54+12x-(90)=0

We add all the numbers together, and all the variables

12x-36=0

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

12x=36

x=36/12

x=3

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