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(1/3)*x+4*y+6 = 2/5 // - 2/5
(1/3)*x+4*y-(2/5)+6 = 0
(1/3)*x+4*y-2/5+6 = 0
1/3*x+4*y+28/5 = 0 // - 4*y+28/5
1/3*x = -(4*y+28/5) // : 1/3
x = (-(4*y+28/5))/1/3
x = -3*(4*y+28/5)
x = -3*(4*y+28/5)
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