3x+8=-9x-40

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Solution for 3x+8=-9x-40 equation: 



3x+8=-9x-40

We move all terms to the left:

3x+8-(-9x-40)=0

We get rid of parentheses

3x+9x+40+8=0

We add all the numbers together, and all the variables

12x+48=0

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

12x=-48

x=-48/12

x=-4

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