-5x+6-4x=21

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Solution for -5x+6-4x=21 equation: 



-5x+6-4x=21

We move all terms to the left:

-5x+6-4x-(21)=0

We add all the numbers together, and all the variables

-9x-15=0

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

-9x=15

x=15/-9

x=-1+2/3

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