4+1+2=21-2z

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Solution for 4+1+2=21-2z equation:


Simplifying
4 + 1 + 2 = 21 + -2z

Combine like terms: 4 + 1 = 5
5 + 2 = 21 + -2z

Combine like terms: 5 + 2 = 7
7 = 21 + -2z

Solving
7 = 21 + -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.
7 + 2z = 21 + -2z + 2z

Combine like terms: -2z + 2z = 0
7 + 2z = 21 + 0
7 + 2z = 21

Add '-7' to each side of the equation.
7 + -7 + 2z = 21 + -7

Combine like terms: 7 + -7 = 0
0 + 2z = 21 + -7
2z = 21 + -7

Combine like terms: 21 + -7 = 14
2z = 14

Divide each side by '2'.
z = 7

Simplifying
z = 7

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