7-3z-4z=28

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Solution for 7-3z-4z=28 equation: 


Simplifying
7 + -3z + -4z = 28

Combine like terms: -3z + -4z = -7z
7 + -7z = 28

Solving
7 + -7z = 28

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 + -7z = 28 + -7

Combine like terms: 7 + -7 = 0
0 + -7z = 28 + -7
-7z = 28 + -7

Combine like terms: 28 + -7 = 21
-7z = 21

Divide each side by '-7'.
z = -3

Simplifying
z = -3

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