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(3x-3)(5x+2)-(15+13x-6)≤0
15-9x-6-15-13x+6≤0
-22x≤0
22x≥0
x є [ 0; +∞ )
2^7+x^7 т.е.2*2*2*2*2*2*2+x*x*x*x*x*x*x