18+3x=420

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Solution for 18+3x=420 equation: 



18+3x=420

We move all terms to the left:

18+3x-(420)=0

We add all the numbers together, and all the variables

3x-402=0

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

3x=402

x=402/3

x=134

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