40=-2(3+a)

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Solution for 40=-2(3+a) equation: 



40=-2(3+a)

We move all terms to the left:

40-(-2(3+a))=0

We add all the numbers together, and all the variables

-(-2(a+3))+40=0



We calculate terms in parentheses: -(-2(a+3)), so:

-2(a+3)

We multiply parentheses

-2a-6

Back to the equation:

-(-2a-6)



We get rid of parentheses

2a+6+40=0

We add all the numbers together, and all the variables

2a+46=0

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

2a=-46

a=-46/2

a=-23

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