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