x+x+x+x-12=120

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Solution for x+x+x+x-12=120 equation: 



x+x+x+x-12=120

We move all terms to the left:

x+x+x+x-12-(120)=0

We add all the numbers together, and all the variables

4x-132=0

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

4x=132

x=132/4

x=33

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