exam Maths Puzzle Numerical Ability

My equation is:

-t
- > -15
2

This is one of the most confusing equations 4 me.

If anyone could help me with this,I will be very thankful

Kia,14

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exam Other Question
How do i solve an equation like 2/3x+1/2y=3 by using the slope and y-intercept, also graph the equation. Also how do i graph equations like y=2x-3, while also graphing? how to find the squar root