19=4-2(t-1)

Solution for 19=4-2(t-1) equation:

Simplifying
19 = 4 + -2(t + -1)

Reorder the terms:
19 = 4 + -2(-1 + t)
19 = 4 + (-1 * -2 + t * -2)
19 = 4 + (2 + -2t)

Combine like terms: 4 + 2 = 6
19 = 6 + -2t

Solving
19 = 6 + -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.
19 + 2t = 6 + -2t + 2t

Combine like terms: -2t + 2t = 0
19 + 2t = 6 + 0
19 + 2t = 6

Add '-19' to each side of the equation.
19 + -19 + 2t = 6 + -19

Combine like terms: 19 + -19 = 0
0 + 2t = 6 + -19
2t = 6 + -19

Combine like terms: 6 + -19 = -13
2t = -13

Divide each side by '2'.
t = -6.5

Simplifying
t = -6.5