450+12x=21x

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Solution for 450+12x=21x equation: 



450+12x=21x

We move all terms to the left:

450+12x-(21x)=0

We add all the numbers together, and all the variables

-9x+450=0

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

-9x=-450

x=-450/-9

x=+50

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