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(13/10)*x+2/5 = (6/5)*X // - (6/5)*X
(13/10)*x-((6/5)*X)+2/5 = 0
(-6/5)*X+(13/10)*x+2/5 = 0
13/10*x-6/5*X+2/5 = 0 // - 2/5-6/5*X
13/10*x = -(2/5-6/5*X) // : 13/10
x = (-(2/5-6/5*X))/13/10
x = -10/13*(2/5-6/5*X)
x = -10/13*(2/5-6/5*X)
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