7x+1.5-8x=-21

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Solution for 7x+1.5-8x=-21 equation: 



7x+1.5-8x=-21

We move all terms to the left:

7x+1.5-8x-(-21)=0

We add all the numbers together, and all the variables

-1x+22.5=0

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

-x=-22.5

x=-22.5/-1

x=22+0.5/1

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