7x+21+4x-4=72

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Solution for 7x+21+4x-4=72 equation: 



7x+21+4x-4=72

We move all terms to the left:

7x+21+4x-4-(72)=0

We add all the numbers together, and all the variables

11x-55=0

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

11x=55

x=55/11

x=5

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