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(2/5)*x-15 = (5/8)*x-16 // - (5/8)*x-16
(2/5)*x-((5/8)*x)-15+16 = 0
(2/5)*x+(-5/8)*x-15+16 = 0
1-9/40*x = 0 // - 1
-9/40*x = -1 // : -9/40
x = -1/(-9/40)
x = 40/9
x = 40/9
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