I can not get he correct answer -10.

-3/3{a+c(b+5)-(-6+a)}
a=1, b=-6, c=-4

starting with

-3/3{a+c(b+5)-(-6+a)}
= -3/3{1+(-4)((-6)+5)-(-6+1)}
let's work our way from the inside out:
-3/3{1+(-4)(-6+5)-(-6+1)}
-3/3{1+(-4)(-1)-(-5)}
-3/3{1+4+5)}
-3/3{10}
-1(10)
-10

Note that the division is done first, then the multiplication, left-to-right

To evaluate the expression, let's substitute the given values for a, b, and c and work step-by-step:

Given:
a = 1
b = -6
c = -4

-3/3{a+c(b+5)-(-6+a)}

Substitute the given values:
-3/3{(1 + (-4)(-6 + 5))-(-6+1)}

Simplify inside the parentheses:
-3/3{(1 + (-4)(-1))-(-5)}

Simplify the multiplication:
-3/3{(1 + 4)-(-5)}

Simplify inside the parentheses:
-3/3{(1 + 4) - (-5)}

Simplify further:
-3/3{5 + 5}

Add the numbers inside the parentheses:
-3/3{10}

Simplify further:
-3/3 * 10

Divide the numbers:
-1 * 10

The result is:
-10

To evaluate the expression, let's start by substituting the given values of a, b, and c into the expression:

-3/3{1 + (-4)(-6 + 5) - (-6 + 1)}

Now, simplify the terms inside the parentheses:

-3/3{1 + (-4)(-1) - (-5)}

Multiply the values inside the parentheses:

-3/3{1 + 4 + 5}

Combine the terms inside the curly braces:

-3/3{10}

Divide -3 by 3:

-1{10}

Multiplication takes precedence, so multiply -1 by 10:

-10

Therefore, the answer is -10.