780=500+7x

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Solution for 780=500+7x equation: 



780=500+7x

We move all terms to the left:

780-(500+7x)=0

We add all the numbers together, and all the variables

-(7x+500)+780=0

We get rid of parentheses

-7x-500+780=0

We add all the numbers together, and all the variables

-7x+280=0

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

-7x=-280

x=-280/-7

x=+40

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