3.9x=-19

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Solution for 3.9x=-19 equation: 



3.9x=-19

We move all terms to the left:

3.9x-(-19)=0

We add all the numbers together, and all the variables

3.9x+19=0

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

3.9x=-19

x=-19/3.9

x=-4+1/1.1470588235294

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