x+x-21=49

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Solution for x+x-21=49 equation: 



x+x-21=49

We move all terms to the left:

x+x-21-(49)=0

We add all the numbers together, and all the variables

2x-70=0

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

2x=70

x=70/2

x=35

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