7z-21=10z-4

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Solution for 7z-21=10z-4 equation:


Simplifying
7z + -21 = 10z + -4

Reorder the terms:
-21 + 7z = 10z + -4

Reorder the terms:
-21 + 7z = -4 + 10z

Solving
-21 + 7z = -4 + 10z

Solving for variable 'z'.

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

Add '-10z' to each side of the equation.
-21 + 7z + -10z = -4 + 10z + -10z

Combine like terms: 7z + -10z = -3z
-21 + -3z = -4 + 10z + -10z

Combine like terms: 10z + -10z = 0
-21 + -3z = -4 + 0
-21 + -3z = -4

Add '21' to each side of the equation.
-21 + 21 + -3z = -4 + 21

Combine like terms: -21 + 21 = 0
0 + -3z = -4 + 21
-3z = -4 + 21

Combine like terms: -4 + 21 = 17
-3z = 17

Divide each side by '-3'.
z = -5.666666667

Simplifying
z = -5.666666667

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