Question

-78 = 5r +3 (5r - 6)

Answer 1

I think it might be r= -3

Answer 2

r=-3

Explanation:

-78=5r+3(5r-6)

Multiply 3 by 5r and -6

-78=5r+15r-18

Combine like terms

-78=20r-18

Add 18 to both sides (-78+18=-60. -18 cancels out.)

-60=20r

Divide 20 to both sides.

-3=r

r=-3