3 (7/3r+4/3) - 2r+8=5r+12

r E R

Explanation : 3 (7/3r+4/3) - 2r+8=5r+12 multiply parentheses by 3

Do bracket first

(7r+4) answer from working out the bracket from above 7r+4-2r+8=5r+12

collect like terms

5r+4+8=5r+12

Add the numbers

5r+12=5r+12

the statement is true for any value of r, because both sides are identical

Solution

r E R