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x in (-oo:+oo)
12*x = (3/2)*y // - (3/2)*y
12*x-((3/2)*y) = 0
12*x+(-3/2)*y = 0
12*x-3/2*y = 0 // + -3/2*y
12*x = -(-3/2*y) // : 12
x = (-(-3/2*y))/12
x = 1/8*y
x = 1/8*y
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