Hello.
Given the equation:

Testing for v = -7

-34 does not equal 21. Therefore, '-7' is not a solution.
Hope I helped.
ANSWER

EXPLANATION
The given formula is

We want to solve for T in the given formula.
We multiply through by 3 first to get,

We simplify to get,

We now divide both sides by S to get,

We simplify to obtain:

or

Answer:
x=−1
Step-by-step explanation: