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x in (-oo:+oo)
(3/5)*x-(1/5) = 7 // - 7
(3/5)*x-(1/5)-7 = 0
(3/5)*x-1/5-7 = 0
3/5*x-36/5 = 0 // + 36/5
3/5*x = 36/5 // : 3/5
x = 36/5/3/5
x = 12
x = 12
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