x2·log343(x+3) ≤ log7(x2+6x+9)
x2·log512(x+5) ≥ log2(x2+10x+25)
x2·log343(x+4) ≤ log7(x2+8x+16)
x2 ·log 625(x–6) <= log5(x2–12x+36)
x2log625(3–x) ≤ log5(x2–6x+9)