4x+7x-21=100

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Solution for 4x+7x-21=100 equation: 



4x+7x-21=100

We move all terms to the left:

4x+7x-21-(100)=0

We add all the numbers together, and all the variables

11x-121=0

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

11x=121

x=121/11

x=11

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