30-4a=-2(7a-5)

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Solution for 30-4a=-2(7a-5) equation: 



30-4a=-2(7a-5)

We move all terms to the left:

30-4a-(-2(7a-5))=0



We calculate terms in parentheses: -(-2(7a-5)), so:

-2(7a-5)

We multiply parentheses

-14a+10

Back to the equation:

-(-14a+10)



We get rid of parentheses

-4a+14a-10+30=0

We add all the numbers together, and all the variables

10a+20=0

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

10a=-20

a=-20/10

a=-2

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