3(-7)+3z=15

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Solution for 3(-7)+3z=15 equation: 


Simplifying
3(-7) + 3z = 15

Multiply 3 * -7
-21 + 3z = 15

Solving
-21 + 3z = 15

Solving for variable 'z'.

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

Add '21' to each side of the equation.
-21 + 21 + 3z = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 3z = 15 + 21
3z = 15 + 21

Combine like terms: 15 + 21 = 36
3z = 36

Divide each side by '3'.
z = 12

Simplifying
z = 12

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