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