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(3/5)*x = 7*(1/2) // - 7*(1/2)
(3/5)*x-(7*(1/2)) = 0
(3/5)*x-7/2 = 0
3/5*x-7/2 = 0 // + 7/2
3/5*x = 7/2 // : 3/5
x = 7/2/3/5
x = 35/6
x = 35/6
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