10x+21=13x=90

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Solution for 10x+21=13x=90 equation: 



10x+21=13x=90

We move all terms to the left:

10x+21-(13x)=0

We add all the numbers together, and all the variables

-3x+21=0

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

-3x=-21

x=-21/-3

x=+7

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