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7*(1/5)*x = 70*(1/5) // - 70*(1/5)
7*(1/5)*x-(70*(1/5)) = 0
7*(1/5)*x-14 = 0
7/5*x-14 = 0 // + 14
7/5*x = 14 // : 7/5
x = 14/7/5
x = 10
x = 10
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