15=-2(2t-t)

Solution for 15=-2(2t-t) equation:

Simplifying
15 = -2(2t + -1t)

Combine like terms: 2t + -1t = 1t
15 = -2(1t)

Remove parenthesis around (1t)
15 = -2 * 1t

Multiply -2 * 1
15 = -2t

Solving
15 = -2t

Solving for variable 't'.

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

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

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

Add '-15' to each side of the equation.
15 + -15 + 2t = 0 + -15

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

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

Divide each side by '2'.
t = -7.5

Simplifying
t = -7.5