10+5x-12x=21

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Solution for 10+5x-12x=21 equation: 



10+5x-12x=21

We move all terms to the left:

10+5x-12x-(21)=0

We add all the numbers together, and all the variables

-7x-11=0

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

-7x=11

x=11/-7

x=-1+4/7

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