18=a-(-20)

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Solution for 18=a-(-20) equation:



18=a-(-20)
We move all terms to the left:
18-(a-(-20))=0
We calculate terms in parentheses: -(a-(-20)), so:
a-(-20)
We add all the numbers together, and all the variables
a+20
Back to the equation:
-(a+20)
We get rid of parentheses
-a-20+18=0
We add all the numbers together, and all the variables
-1a-2=0
We move all terms containing a to the left, all other terms to the right
-a=2
a=2/-1
a=-2

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