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(4*y)/4 = (12*x)/4 // - (12*x)/4
(4*y)/4-((12*x)/4) = 0
(4*y)/4-3*x = 0
y-3*x = 0 // - y
-3*x = -y // : -3
x = -y/(-3)
x = y/3
x = y/3
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