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-3-a(a+1)=a(1-a)
We move all terms to the left:
-3-a(a+1)-(a(1-a))=0
We add all the numbers together, and all the variables
-a(a+1)-(a(-1a+1))-3=0
We multiply parentheses
-a^2-a-(a(-1a+1))-3=0
We calculate terms in parentheses: -(a(-1a+1)), so:We add all the numbers together, and all the variables
a(-1a+1)
We multiply parentheses
-1a^2+a
Back to the equation:
-(-1a^2+a)
-1a^2-(-1a^2+a)-1a-3=0
We get rid of parentheses
-1a^2+1a^2-a-1a-3=0
We add all the numbers together, and all the variables
-2a-3=0
We move all terms containing a to the left, all other terms to the right
-2a=3
a=3/-2
a=-1+1/2
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