x+x+x-9+x-9=70

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



x+x+x-9+x-9=70

We move all terms to the left:

x+x+x-9+x-9-(70)=0

We add all the numbers together, and all the variables

4x-88=0

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

4x=88

x=88/4

x=22

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