Решите пожалуйста
1) x-4,2=6,9
2) 0,3x=15
3) 3(2x+5)-2(3x+1)=2
4) 6x²+x=0
5) -0,3x меньше 9,6
6) 2(x+3)≥2x
7) 6x²-5x-1≤0
8) x²-16/ 2x²+5x-12≥0
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