4x+5x=21

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Solution for 4x+5x=21 equation:



4x+5x=21
We move all terms to the left:
4x+5x-(21)=0
We add all the numbers together, and all the variables
9x-21=0
We move all terms containing x to the left, all other terms to the right
9x=21
x=21/9
x=2+1/3

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