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25*((5/7)*x+1/4) = 0
25*(5/7*x+1/4) = 0
5/7*x+1/4 = 0 // - 1/4
5/7*x = -1/4 // : 5/7
x = -1/4/5/7
x = -7/20
x = -7/20
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