7x-8x=-4-21

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Solution for 7x-8x=-4-21 equation: 



7x-8x=-4-21

We move all terms to the left:

7x-8x-(-4-21)=0

We add all the numbers together, and all the variables

7x-8x-(-25)=0

We add all the numbers together, and all the variables

-1x+25=0

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

-x=-25

x=-25/-1

x=+25

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