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x-y = 42
(236- y) -y = 42
236 -2y= 42
236-42 = 2y
2y=194
y= 194/2= 97
x = 236-97=139
a - b = 42 -
2b = 194
b = 97
a = 42 + b
= 42 + 97
= 139