1300+21x=x

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Solution for 1300+21x=x equation: 



1300+21x=x

We move all terms to the left:

1300+21x-(x)=0

We add all the numbers together, and all the variables

20x+1300=0

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

20x=-1300

x=-1300/20

x=-65

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