18-20=a

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Solution for 18-20=a equation:


18-20=a

We simplify the equation to the form, which is simple to understand 
18-20=a

We move all terms containing a to the left and all other terms to the right. 
-1a=-18+20

We simplify left and right side of the equation. 
-1a=+2

We divide both sides of the equation by -01 to get a. 
a=-2

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