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18-12t=1+4\left(5-3i\right)
Use the distributive property to multiply 6 by 3-2t.
18-12t=1+4\times 5+4\times \left(-3i\right)
Multiply 4 times 5-3i.
18-12t=1+\left(20-12i\right)
Do the multiplications in 4\times 5+4\times \left(-3i\right).
18-12t=1+20-12i
Combine the real and imaginary parts in 1+20-12i.
18-12t=21-12i
Add 1 to 20.
-12t=21-12i-18
Subtract 18 from both sides.
-12t=21-18-12i
Subtract 18 from 21-12i by subtracting corresponding real and imaginary parts.
-12t=3-12i
Subtract 18 from 21 to get 3.
t=\frac{3-12i}{-12}
Divide both sides by -12.
t=-\frac{1}{4}+i
Divide 3-12i by -12 to get -\frac{1}{4}+i.