4(5+a)-2a=28

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Solution for 4(5+a)-2a=28 equation: 



4(5+a)-2a=28

We move all terms to the left:

4(5+a)-2a-(28)=0

We add all the numbers together, and all the variables

4(a+5)-2a-28=0

We add all the numbers together, and all the variables

-2a+4(a+5)-28=0

We multiply parentheses

-2a+4a+20-28=0

We add all the numbers together, and all the variables

2a-8=0

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

2a=8

a=8/2

a=4

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