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x in (-oo:+oo)
(-4/5)*x-12 = -5 // + 5
(-4/5)*x-12+5 = 0
-4/5*x-7 = 0 // + 7
-4/5*x = 7 // : -4/5
x = 7/(-4/5)
x = -35/4
x = -35/4
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