7a=-4.2

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Solution for 7a=-4.2 equation: 



7a=-4.2

We move all terms to the left:

7a-(-4.2)=0

We add all the numbers together, and all the variables

7a+4.2=0

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

7a=-4.2

a=-4.2/7

a=-3.5/5.8333333333333

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