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100-((5*((100-(5*x))/14))/14) = 0
(-5/196)*(100-5*x)+100 = 0
100-5/196*(100-5*x) = 0
100-5/196*(100-5*x) = 0
25/196*x+4775/49 = 0
25/196*x+4775/49 = 0
25/196*x+4775/49 = 0 // - 4775/49
25/196*x = -4775/49 // : 25/196
x = -4775/49/25/196
x = -764
x = -764
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