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