X+40+x+100=120

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Solution for X+40+x+100=120 equation: 



X+40+X+100=120

We move all terms to the left:

X+40+X+100-(120)=0

We add all the numbers together, and all the variables

2X+20=0

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

2X=-20

X=-20/2

X=-10

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