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47 = (-7/5)*x // - (-7/5)*x
47-((-7/5)*x) = 0
(7/5)*x+47 = 0
7/5*x+47 = 0 // - 47
7/5*x = -47 // : 7/5
x = -47/7/5
x = -235/7
x = -235/7
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