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y = 57 - 8x
6x + 3y = 126
6x + 3(57 - 8x) = 126
6x + 171 - 24x = 126
-18x = -45
x = 45/18
x = 15/6
y = 57 - 8x
y = 57 - 8(15/6)
y = 57 - 120/6
y = 57 - 20
y = 37