r=2(i-2i)

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Solution for r=2(i-2i) equation: 


Simplifying
r = 2(i + -2i)

Combine like terms: i + -2i = -1i
r = 2(-1i)

Remove parenthesis around (-1i)
r = 2 * -1i

Multiply 2 * -1
r = -2i

Solving
r = -2i

Solving for variable 'r'.

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

Simplifying
r = -2i

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