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15-1 = (4/5)*x // - (4/5)*x
15-((4/5)*x)-1 = 0
(-4/5)*x-1+15 = 0
14-4/5*x = 0 // - 14
-4/5*x = -14 // : -4/5
x = -14/(-4/5)
x = 35/2
x = 35/2
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