21x+6-25x=1-7

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Solution for 21x+6-25x=1-7 equation: 



21x+6-25x=1-7

We move all terms to the left:

21x+6-25x-(1-7)=0

We add all the numbers together, and all the variables

21x-25x+6-(-6)=0

We add all the numbers together, and all the variables

-4x+12=0

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

-4x=-12

x=-12/-4

x=+3

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