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x in (-oo:+oo)
(-3/5)*x = 7 // - 7
(-3/5)*x-7 = 0
-3/5*x-7 = 0 // + 7
-3/5*x = 7 // : -3/5
x = 7/(-3/5)
x = -35/3
x = -35/3
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