-40=-4(-z+7)

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Solution for -40=-4(-z+7) equation:


Simplifying
-40 = -4(-1z + 7)

Reorder the terms:
-40 = -4(7 + -1z)
-40 = (7 * -4 + -1z * -4)
-40 = (-28 + 4z)

Solving
-40 = -28 + 4z

Solving for variable 'z'.

Move all terms containing z to the left, all other terms to the right.

Add '-4z' to each side of the equation.
-40 + -4z = -28 + 4z + -4z

Combine like terms: 4z + -4z = 0
-40 + -4z = -28 + 0
-40 + -4z = -28

Add '40' to each side of the equation.
-40 + 40 + -4z = -28 + 40

Combine like terms: -40 + 40 = 0
0 + -4z = -28 + 40
-4z = -28 + 40

Combine like terms: -28 + 40 = 12
-4z = 12

Divide each side by '-4'.
z = -3

Simplifying
z = -3

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