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16 = (18/25)*x-x // - (18/25)*x-x
x-((18/25)*x)+16 = 0
(-18/25)*x+x+16 = 0
7/25*x+16 = 0 // - 16
7/25*x = -16 // : 7/25
x = -16/7/25
x = -400/7
x = -400/7
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