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x in (-oo:+oo)
(-1/3)*x-(5/2) = -7/5 // + -7/5
(-1/3)*x-(5/2)-(-7/5) = 0
(-1/3)*x-5/2+7/5 = 0
-1/3*x-11/10 = 0 // + 11/10
-1/3*x = 11/10 // : -1/3
x = 11/10/(-1/3)
x = -33/10
x = -33/10
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