42.12=-7.8t

Solution for 42.12=-7.8t equation:

Simplifying
42.12 = -7.8t

Solving
42.12 = -7.8t

Solving for variable 't'.

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

Add '7.8t' to each side of the equation.
42.12 + 7.8t = -7.8t + 7.8t

Combine like terms: -7.8t + 7.8t = 0.0
42.12 + 7.8t = 0.0

Add '-42.12' to each side of the equation.
42.12 + -42.12 + 7.8t = 0.0 + -42.12

Combine like terms: 42.12 + -42.12 = 0.00
0.00 + 7.8t = 0.0 + -42.12
7.8t = 0.0 + -42.12

Combine like terms: 0.0 + -42.12 = -42.12
7.8t = -42.12

Divide each side by '7.8'.
t = -5.4

Simplifying
t = -5.4