(10+20)*10=(13+x)*13

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Solution for (10+20)*10=(13+x)*13 equation: 



(10+20)*10=(13+x)*13

We move all terms to the left:

(10+20)*10-((13+x)*13)=0

We add all the numbers together, and all the variables

-((x+13)*13)+30*10=0

We add all the numbers together, and all the variables

-((x+13)*13)+300=0



We calculate terms in parentheses: -((x+13)*13), so:

(x+13)*13

We multiply parentheses

13x+169

Back to the equation:

-(13x+169)



We get rid of parentheses

-13x-169+300=0

We add all the numbers together, and all the variables

-13x+131=0

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

-13x=-131

x=-131/-13

x=10+1/13

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