42=-2t+9t

Solution for 42=-2t+9t equation:

Simplifying
42 = -2t + 9t

Combine like terms: -2t + 9t = 7t
42 = 7t

Solving
42 = 7t

Solving for variable 't'.

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

Add '-7t' to each side of the equation.
42 + -7t = 7t + -7t

Combine like terms: 7t + -7t = 0
42 + -7t = 0

Add '-42' to each side of the equation.
42 + -42 + -7t = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -7t = 0 + -42
-7t = 0 + -42

Combine like terms: 0 + -42 = -42
-7t = -42

Divide each side by '-7'.
t = 6

Simplifying
t = 6