X+x+X+x-9=70

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Solution for X+x+X+x-9=70 equation:



X+X+X+X-9=70
We move all terms to the left:
X+X+X+X-9-(70)=0
We add all the numbers together, and all the variables
4X-79=0
We move all terms containing X to the left, all other terms to the right
4X=79
X=79/4
X=19+3/4

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