4x+12+7x+21=90

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Solution for 4x+12+7x+21=90 equation: 



4x+12+7x+21=90

We move all terms to the left:

4x+12+7x+21-(90)=0

We add all the numbers together, and all the variables

11x-57=0

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

11x=57

x=57/11

x=5+2/11

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