3x-4=12-40

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Solution for 3x-4=12-40 equation: 



3x-4=12-40

We move all terms to the left:

3x-4-(12-40)=0

We add all the numbers together, and all the variables

3x-4-(-28)=0

We add all the numbers together, and all the variables

3x+24=0

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

3x=-24

x=-24/3

x=-8

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