7x+4x-X=8+53-21

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Solution for 7x+4x-X=8+53-21 equation: 



7x+4x-x=8+53-21

We move all terms to the left:

7x+4x-x-(8+53-21)=0

We add all the numbers together, and all the variables

7x+4x-x-40=0

We add all the numbers together, and all the variables

10x-40=0

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

10x=40

x=40/10

x=4

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