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3*x+y/4 = -y/8 // + -y/8
3*x+y/4-(-y/8) = 0
3*x+y/4+(1/8)*y = 0
3*x+3/8*y = 0 // - 3/8*y
3*x = -(3/8*y) // : 3
x = (-(3/8*y))/3
x = -1/8*y
x = -1/8*y
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