21x+12x=66

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Solution for 21x+12x=66 equation: 



21x+12x=66

We move all terms to the left:

21x+12x-(66)=0

We add all the numbers together, and all the variables

33x-66=0

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

33x=66

x=66/33

x=2

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