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7/4 = (-7/8)*x-(5/2) // - (-7/8)*x-(5/2)
7/4-((-7/8)*x)+5/2 = 0
(7/8)*x+7/4+5/2 = 0
7/8*x+17/4 = 0 // - 17/4
7/8*x = -17/4 // : 7/8
x = -17/4/7/8
x = -34/7
x = -34/7
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