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7/2.5 = 25*x // - 25*x
7/2.5-(25*x) = 0
7/2.5-25*x = 0
2.8-25*x = 0 // - 2.8
-25*x = -2.8 // : -25
x = -2.8/(-25)
x = 0.112
x = 0.112
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