(x+307)-459=687
x + 307 – 459 = 687
x = 687 + 459 – 307
x = 839
(y+39)+907=5009
y + 39 + 907 = 5009
y = 5009 – 907 – 39
y = 4063
241-(r-72)=17
241 – r + 72 = 17
– r = 17 – 72 – 241
-r = -296
r = 296
(x+307)-459=687
x + 307 – 459 = 687
x = 687 + 459 – 307
x = 839
(y+39)+907=5009
y + 39 + 907 = 5009
y = 5009 – 907 – 39
y = 4063
241-(r-72)=17
241 – r + 72 = 17
– r = 17 – 72 – 241
-r = -296
r = 296