(15-3i)-(4-12i)=

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Solution for (15-3i)-(4-12i)= equation:


Simplifying
(15 + -3i) + -1(4 + -12i) = 0

Remove parenthesis around (15 + -3i)
15 + -3i + -1(4 + -12i) = 0
15 + -3i + (4 * -1 + -12i * -1) = 0
15 + -3i + (-4 + 12i) = 0

Reorder the terms:
15 + -4 + -3i + 12i = 0

Combine like terms: 15 + -4 = 11
11 + -3i + 12i = 0

Combine like terms: -3i + 12i = 9i
11 + 9i = 0

Solving
11 + 9i = 0

Solving for variable 'i'.

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

Add '-11' to each side of the equation.
11 + -11 + 9i = 0 + -11

Combine like terms: 11 + -11 = 0
0 + 9i = 0 + -11
9i = 0 + -11

Combine like terms: 0 + -11 = -11
9i = -11

Divide each side by '9'.
i = -1.222222222

Simplifying
i = -1.222222222

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