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(13/10)*x-(5/2) = (4/5)*x // - (4/5)*x
(13/10)*x-((4/5)*x)-(5/2) = 0
(13/10)*x+(-4/5)*x-5/2 = 0
1/2*x-5/2 = 0 // + 5/2
1/2*x = 5/2 // : 1/2
x = 5/2/1/2
x = 5
x = 5
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