-3(t-7)-(t+8)=4

Solution for -3(t-7)-(t+8)=4 equation:

Simplifying
-3(t + -7) + -1(t + 8) = 4

Reorder the terms:
-3(-7 + t) + -1(t + 8) = 4
(-7 * -3 + t * -3) + -1(t + 8) = 4
(21 + -3t) + -1(t + 8) = 4

Reorder the terms:
21 + -3t + -1(8 + t) = 4
21 + -3t + (8 * -1 + t * -1) = 4
21 + -3t + (-8 + -1t) = 4

Reorder the terms:
21 + -8 + -3t + -1t = 4

Combine like terms: 21 + -8 = 13
13 + -3t + -1t = 4

Combine like terms: -3t + -1t = -4t
13 + -4t = 4

Solving
13 + -4t = 4

Solving for variable 't'.

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

Add '-13' to each side of the equation.
13 + -13 + -4t = 4 + -13

Combine like terms: 13 + -13 = 0
0 + -4t = 4 + -13
-4t = 4 + -13

Combine like terms: 4 + -13 = -9
-4t = -9

Divide each side by '-4'.
t = 2.25

Simplifying
t = 2.25