3-15=-2z

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Solution for 3-15=-2z equation:


Simplifying
3 + -15 = -2z

Combine like terms: 3 + -15 = -12
-12 = -2z

Solving
-12 = -2z

Solving for variable 'z'.

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

Add '2z' to each side of the equation.
-12 + 2z = -2z + 2z

Combine like terms: -2z + 2z = 0
-12 + 2z = 0

Add '12' to each side of the equation.
-12 + 12 + 2z = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 2z = 0 + 12
2z = 0 + 12

Combine like terms: 0 + 12 = 12
2z = 12

Divide each side by '2'.
z = 6

Simplifying
z = 6

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