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4x - 3y = 36
2x + 3y = -18
4x - 3y = 36
_____________+
6x = 18
x = 3
4(3) - 3y = 36
12 - 3y = 36
-3y = 24
y = -8
x = a, y = b
a-b = 3 - (-8) = 3 + 8 = 11