Answer:
r = 2
Step-by-step explanation:
Given
8 = - 3r + 7r ← combine terms
8 = 4r ( divide both sides by 4 )
2 = r
r=2
8 = −3r +7r
Step 1: Combine like-terms (-3r + 7r = 4r)
8=4r
Step 2: Divide both sides by 4 to isolate the variable
(8 divided by 4 = 2)
(4r divided by 4 = r)
2=r
