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x in (-oo:+oo)
(-4/5)*(x+8) = 12 // - 12
(-4/5)*(x+8)-12 = 0
-4/5*(x+8)-12 = 0
-4/5*(x+8)-12 = 0
-4/5*x-92/5 = 0
-4/5*x-92/5 = 0
-4/5*x-92/5 = 0 // + 92/5
-4/5*x = 92/5 // : -4/5
x = 92/5/(-4/5)
x = -23
x = -23
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