52+y+87=159
52+y=159-87
52+y=72
y=72-52
y=20
--------------------------------------
144-y-54=37
144-y=54+37
144-y=91
y=144-91
y=53
----------------------------------------
125+y=85+65
125+y=150
y=150-125
y=25
--------------------------------------
127+y=357-85
127+y=272
y=272-127
y=145