How do you work this problem out -7+4r =100

Question: -7 + 4r = 100

Steps:

1. Add 7 to both sides

-7 + 7 + 4r = 100 + 7

2. Simplify,

4r = 107

3. Divide both sides by 4:

4r/4 = 107/4

4. Simplify,

r = 26.75 < Answer

Hope this helped!!!

The answer is:

R = 107/4

1 Regroup terms:

4r−7=100

2 Add:

4r=100+7

3 Simplify:

4r=107

4 Divide both sides:

R = 107/4

Thanks for the pic. I calculated the sides using pythagorean formula. I counted the boxes and found the a's and b'so. Came up with short side being √37 and the larger side √148.
A=lw
A=√37 x √148
A=√5476
A=74 units ^2

You actually get 2 solutions but area is positive.