2.1z-1.9z=-4

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Solution for 2.1z-1.9z=-4 equation: 



2.1z-1.9z=-4

We move all terms to the left:

2.1z-1.9z-(-4)=0

We add all the numbers together, and all the variables

0.2z+4=0

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

0.2z=-4

z=-4/0.2

z=-20

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