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7 = 19*(x/100) // - 19*(x/100)
7-(19*(x/100)) = 0
(-19/100)*x+7 = 0
7-19/100*x = 0 // - 7
-19/100*x = -7 // : -19/100
x = -7/(-19/100)
x = 700/19
x = 700/19
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