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(5*x+3)/3 = 9/12 // - 9/12
(5*x+3)/3-(9/12) = 0
(5*x+3)/3-3/4 = 0
(4*(5*x+3))/(3*4)+(-3*3)/(3*4) = 0
4*(5*x+3)-3*3 = 0
20*x+3 = 0
(20*x+3)/(3*4) = 0
(20*x+3)/(3*4) = 0 // * 3*4
20*x+3 = 0
20*x+3 = 0 // - 3
20*x = -3 // : 20
x = -3/20
x = -3/20
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