-51=7x+7x=140

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Solution for -51=7x+7x=140 equation: 



-51=7x+7x=140

We move all terms to the left:

-51-(7x+7x)=0

We add all the numbers together, and all the variables

-(+14x)-51=0

We get rid of parentheses

-14x-51=0

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

-14x=51

x=51/-14

x=-3+9/14

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