(4-2i)+(3+9i)=

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Solution for (4-2i)+(3+9i)= equation:


Simplifying
(4 + -2i) + (3 + 9i) = 0

Remove parenthesis around (4 + -2i)
4 + -2i + (3 + 9i) = 0

Remove parenthesis around (3 + 9i)
4 + -2i + 3 + 9i = 0

Reorder the terms:
4 + 3 + -2i + 9i = 0

Combine like terms: 4 + 3 = 7
7 + -2i + 9i = 0

Combine like terms: -2i + 9i = 7i
7 + 7i = 0

Solving
7 + 7i = 0

Solving for variable 'i'.

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

Add '-7' to each side of the equation.
7 + -7 + 7i = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 7i = 0 + -7
7i = 0 + -7

Combine like terms: 0 + -7 = -7
7i = -7

Divide each side by '7'.
i = -1

Simplifying
i = -1

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