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x in (-oo:+oo)
1*(2/5)*x = 7 // - 7
1*(2/5)*x-7 = 0
(2/5)*x-7 = 0
2/5*x-7 = 0 // + 7
2/5*x = 7 // : 2/5
x = 7/2/5
x = 35/2
x = 35/2
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