Whats the answer to 4 (2r+8) = 88

Undo multiplication by 4 by dividing each side by 4.

%284%282r%2B8%29%29%2F4=88%2F4

2r%2B8=22

Next, undo the addition of 8 by subtracting 8 from each side:

2r%2B8-8=22-8

2r=14

Finally, undo the multiplication by 2 by dividing both sides by 2:

r=7

4 (2r+8) = 88

8r+32=88

8r=88-32

8r=56

r=56/8

r=7