120=x+(x+30)

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Solution for 120=x+(x+30) equation: 



120=x+(x+30)

We move all terms to the left:

120-(x+(x+30))=0



We calculate terms in parentheses: -(x+(x+30)), so:

x+(x+30)

We get rid of parentheses

x+x+30

We add all the numbers together, and all the variables

2x+30

Back to the equation:

-(2x+30)



We get rid of parentheses

-2x-30+120=0

We add all the numbers together, and all the variables

-2x+90=0

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

-2x=-90

x=-90/-2

x=+45

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