9z+40+5z-12z-42=40

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Solution for 9z+40+5z-12z-42=40 equation:


Simplifying
9z + 40 + 5z + -12z + -42 = 40

Reorder the terms:
40 + -42 + 9z + 5z + -12z = 40

Combine like terms: 40 + -42 = -2
-2 + 9z + 5z + -12z = 40

Combine like terms: 9z + 5z = 14z
-2 + 14z + -12z = 40

Combine like terms: 14z + -12z = 2z
-2 + 2z = 40

Solving
-2 + 2z = 40

Solving for variable 'z'.

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

Add '2' to each side of the equation.
-2 + 2 + 2z = 40 + 2

Combine like terms: -2 + 2 = 0
0 + 2z = 40 + 2
2z = 40 + 2

Combine like terms: 40 + 2 = 42
2z = 42

Divide each side by '2'.
z = 21

Simplifying
z = 21

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