Solve -3 (r + 5) = -9 enter ur answer in the box x = __
Mathematics · Middle School · Tue Nov 03 2020
Answered on
First of all, lets remove the brackets by multiplying the number -3 with the bracket (r+5).
-3(r+5)=
=-3r-15
Now we have:
-3r-15 = -9
Lets put the variables on one side and the numbers on the other side. Every variable or number that will change signs, will have their sign changed from a + into a - and vice versa.
-3r=-9+15
-3r=6
Divide both sides with -3.
-3r/(-3) = 6/(-3)
r=-2