10-(2a+5)=20

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Solution for 10-(2a+5)=20 equation: 



10-(2a+5)=20

We move all terms to the left:

10-(2a+5)-(20)=0

We add all the numbers together, and all the variables

-(2a+5)-10=0

We get rid of parentheses

-2a-5-10=0

We add all the numbers together, and all the variables

-2a-15=0

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

-2a=15

a=15/-2

a=-7+1/2

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