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20+ x + DC = 15 + y + DC
20+15+x+y=53
20 - 15 = y - x
x + y = 53 - 35
5 = y-x
x+y = 18
5+x=y
x+y=18
x+ (5+x) = 18
5+x=y
2x+5=18
5+x=y
2x=13
y=5+x
x=6.5
y=5+6.5
x=6.5
y=11.5