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Greatest integer function (=step function) problem

In this question it tells me to find the zeros which means that f(x) = 0. However my problem is that, I do not know how to undo the [] brackets. Lets say we were given the following square root function and we wanted to find its zero:

f(x) = sqrt(x)

0 = sqrt(x)

0^2 = (sqrt(x))^2

0 = x

x = 0

(notice how the square root was **undone** by squaring sqrt(x))

for the step function:

f(x) = 3[-(x-1)/2] + 6

0 = 3[-(x-1)/2] + 6

-6/3 = [-(x-1)/2]

-2 = [-(x-1)/2]

^^ Here is where I am stuck since I do not know how to undo the [] brackets.^^

Any help would be greatly appreciated!

Thanks in advance!