3x+12=7-40

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Solution for 3x+12=7-40 equation: 



3x+12=7-40

We move all terms to the left:

3x+12-(7-40)=0

We add all the numbers together, and all the variables

3x+12-(-33)=0

We add all the numbers together, and all the variables

3x+45=0

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

3x=-45

x=-45/3

x=-15

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