15=-2[2t-1]

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Solution for 15=-2[2t-1] equation:


Simplifying
15 = -2[2t + -1]

Reorder the terms:
15 = -2[-1 + 2t]
15 = [-1 * -2 + 2t * -2]
15 = [2 + -4t]

Solving
15 = 2 + -4t

Solving for variable 't'.

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

Add '4t' to each side of the equation.
15 + 4t = 2 + -4t + 4t

Combine like terms: -4t + 4t = 0
15 + 4t = 2 + 0
15 + 4t = 2

Add '-15' to each side of the equation.
15 + -15 + 4t = 2 + -15

Combine like terms: 15 + -15 = 0
0 + 4t = 2 + -15
4t = 2 + -15

Combine like terms: 2 + -15 = -13
4t = -13

Divide each side by '4'.
t = -3.25

Simplifying
t = -3.25

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