Question

Solve r(s+t)=u for the variable t. Describe the operations used to solve.

Answer 1

R(s+t)=u
rs+rt=u
-rs -rs
rt=u-rs
---------
r
t= u-rs/r


------
r & /r = division

Your using:
Multiplication x
Subtraction -
Division / or ------
NO ADDITION +

Hope that helped :)

Answer 2

Distribution, subtraction, divison and stuff

distribute
rs+rt=u
minus rs both sides
rt=u-rs
divide by r
t=(u-rs)/r