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x in (-oo:+oo)
-((2/5)*x)-5/3 = -7/4 // + -7/4
-((2/5)*x)-5/3-(-7/4) = 0
(-2/5)*x-5/3+7/4 = 0
1/12-2/5*x = 0 // - 1/12
-2/5*x = -1/12 // : -2/5
x = -1/12/(-2/5)
x = 5/24
x = 5/24
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