21=91-j

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Solution for 21=91-j equation:


Simplifying
21 = 91 + -1j

Solving
21 = 91 + -1j

Solving for variable 'j'.

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

Add 'j' to each side of the equation.
21 + j = 91 + -1j + j

Combine like terms: -1j + j = 0
21 + j = 91 + 0
21 + j = 91

Add '-21' to each side of the equation.
21 + -21 + j = 91 + -21

Combine like terms: 21 + -21 = 0
0 + j = 91 + -21
j = 91 + -21

Combine like terms: 91 + -21 = 70
j = 70

Simplifying
j = 70

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