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(5/6)*x-((3/4)*x)+(1/2)*y-((1/12)*y) = 0
(-3/4)*x+(5/6)*x+(1/2)*y+(-1/12)*y = 0
1/12*x+5/12*y = 0 // - 5/12*y
1/12*x = -(5/12*y) // : 1/12
x = (-(5/12*y))/1/12
x = -5*y
x = -5*y
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