Explanation

To solve the equation:

75 - 9t = 5(-4 + 2t)

Expand the right-hand side:

75 - 9t = -20 + 10t

Add 9t to both sides:

75 = -20 + 19t

Add 20 to both sides:

95 = 19t

Divide by 19:

t = 95/19

t = 5