186.9=-4.2a

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Solution for 186.9=-4.2a equation: 



186.9=-4.2a

We move all terms to the left:

186.9-(-4.2a)=0

We get rid of parentheses

4.2a+186.9=0

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

4.2a=-186.9

a=-186.9/4.2

a=-44+1/2

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