-4x+21=45

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Solution for -4x+21=45 equation: 



-4x+21=45

We move all terms to the left:

-4x+21-(45)=0

We add all the numbers together, and all the variables

-4x-24=0

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

-4x=24

x=24/-4

x=-6

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