To solve for a variable, you just need to isolate the variable to one side.
7.
For this, just divide both sides by r and your answer will be [tex]\frac{d}{r}=t[/tex]
8.
For this, divide both sides by nR and your answer will be [tex]\frac{PV}{nR}=T[/tex]
9.
Firstly, multiply both sides by T: [tex]AT=FV-OV[/tex]
Next, subtract FV on both sides of the equation: [tex]AT-FV=-OV[/tex]
Lastly, multiply both sides by -1, and your answer will be [tex]-AT+FV=OV[/tex]
10.
Firstly, multiply both sides by 1000: [tex]1000C=Wtc[/tex]
Lastly, divide both sides by tc and your answer will be [tex]\frac{1000C}{tc}=W[/tex]
