21+j=9-3j

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Solution for 21+j=9-3j equation:


Simplifying
21 + j = 9 + -3j

Solving
21 + j = 9 + -3j

Solving for variable 'j'.

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

Add '3j' to each side of the equation.
21 + j + 3j = 9 + -3j + 3j

Combine like terms: j + 3j = 4j
21 + 4j = 9 + -3j + 3j

Combine like terms: -3j + 3j = 0
21 + 4j = 9 + 0
21 + 4j = 9

Add '-21' to each side of the equation.
21 + -21 + 4j = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 4j = 9 + -21
4j = 9 + -21

Combine like terms: 9 + -21 = -12
4j = -12

Divide each side by '4'.
j = -3

Simplifying
j = -3

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