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(2/5)*x+3 = (6/5)*x-13 // - (6/5)*x-13
(2/5)*x-((6/5)*x)+3+13 = 0
(2/5)*x+(-6/5)*x+3+13 = 0
16-4/5*x = 0 // - 16
-4/5*x = -16 // : -4/5
x = -16/(-4/5)
x = 20
x = 20
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