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5*x+9/2 = 2*x+12/7 // - 2*x+12/7
5*x-(2*x)+9/2-(12/7) = 0
5*x-2*x+9/2-12/7 = 0
3*x+39/14 = 0 // - 39/14
3*x = -39/14 // : 3
x = -39/14/3
x = -13/14
x = -13/14
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