20z+3z-21z-1=13

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Solution for 20z+3z-21z-1=13 equation:


Simplifying
20z + 3z + -21z + -1 = 13

Reorder the terms:
-1 + 20z + 3z + -21z = 13

Combine like terms: 20z + 3z = 23z
-1 + 23z + -21z = 13

Combine like terms: 23z + -21z = 2z
-1 + 2z = 13

Solving
-1 + 2z = 13

Solving for variable 'z'.

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

Add '1' to each side of the equation.
-1 + 1 + 2z = 13 + 1

Combine like terms: -1 + 1 = 0
0 + 2z = 13 + 1
2z = 13 + 1

Combine like terms: 13 + 1 = 14
2z = 14

Divide each side by '2'.
z = 7

Simplifying
z = 7

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