7-15=-4z

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Solution for 7-15=-4z equation:


Simplifying
7 + -15 = -4z

Combine like terms: 7 + -15 = -8
-8 = -4z

Solving
-8 = -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.
-8 + 4z = -4z + 4z

Combine like terms: -4z + 4z = 0
-8 + 4z = 0

Add '8' to each side of the equation.
-8 + 8 + 4z = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 4z = 0 + 8
4z = 0 + 8

Combine like terms: 0 + 8 = 8
4z = 8

Divide each side by '4'.
z = 2

Simplifying
z = 2

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