-2(t-9)-(t+3)=0

Solution for -2(t-9)-(t+3)=0 equation:

Simplifying
-2(t + -9) + -1(t + 3) = 0

Reorder the terms:
-2(-9 + t) + -1(t + 3) = 0
(-9 * -2 + t * -2) + -1(t + 3) = 0
(18 + -2t) + -1(t + 3) = 0

Reorder the terms:
18 + -2t + -1(3 + t) = 0
18 + -2t + (3 * -1 + t * -1) = 0
18 + -2t + (-3 + -1t) = 0

Reorder the terms:
18 + -3 + -2t + -1t = 0

Combine like terms: 18 + -3 = 15
15 + -2t + -1t = 0

Combine like terms: -2t + -1t = -3t
15 + -3t = 0

Solving
15 + -3t = 0

Solving for variable 't'.

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

Add '-15' to each side of the equation.
15 + -15 + -3t = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -3t = 0 + -15
-3t = 0 + -15

Combine like terms: 0 + -15 = -15
-3t = -15

Divide each side by '-3'.
t = 5

Simplifying
t = 5