3x+6+4x+21=90

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Solution for 3x+6+4x+21=90 equation: 



3x+6+4x+21=90

We move all terms to the left:

3x+6+4x+21-(90)=0

We add all the numbers together, and all the variables

7x-63=0

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

7x=63

x=63/7

x=9

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