210=12x+3x

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Solution for 210=12x+3x equation: 



210=12x+3x

We move all terms to the left:

210-(12x+3x)=0

We add all the numbers together, and all the variables

-(+15x)+210=0

We get rid of parentheses

-15x+210=0

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

-15x=-210

x=-210/-15

x=+14

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