7-4z=15

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Solution for 7-4z=15 equation: 


Simplifying
7 + -4z = 15

Solving
7 + -4z = 15

Solving for variable 'z'.

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

Add '-7' to each side of the equation.
7 + -7 + -4z = 15 + -7

Combine like terms: 7 + -7 = 0
0 + -4z = 15 + -7
-4z = 15 + -7

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

Divide each side by '-4'.
z = -2

Simplifying
z = -2

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