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40x + 8y = 8x - 4y
32x = -12y
8x = -3y
x= -3/8 y
15x + 10 y = 30
15(-3/8y) + 10 y = 30
-45/8 y + 10 Y = 30
35/8 y = 30
y= 6.85
x= -2.57