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(2/5)*x-1 = -13/15 // + -13/15
(2/5)*x-(-13/15)-1 = 0
(2/5)*x+13/15-1 = 0
2/5*x-2/15 = 0 // + 2/15
2/5*x = 2/15 // : 2/5
x = 2/15/2/5
x = 1/3
x = 1/3
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