Question 178768
-7+4r=-15 
:
4r=-8.....added 7 to both sides
:
{{{highlight(r=-2)}}}divided both sides by 4 to isolate the variable r
:
-5x+13=-17 
:
-5x=-30.....subtracted 13 from both sides
:
{{{highlight(x=6)}}}divided both sides by -5 to isolate the variable x