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`-2z+4=-7`

We simplify the equation to the form, which is simple to understand

-2z+4=-7

We move all terms containing z to the left and all other terms to the right.

-2z=-7-4

We simplify left and right side of the equation.

-2z=-11

We divide both sides of the equation by -2 to get z.

z=5.5

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