Okay lets say that the bench is B
B + B-91 = 659
2B -91 = 659
Add 91 to both sides of the equation to isolate the 2B
2B - 91 + 91 = 659 + 91
2B = 750
Divide both sides by 2 to get 1B
2B ÷ 2 = 750 ÷ 2
B is 375
Therefore the bench was $375 and the garden table was $284.