Решить уравнения плиз
1) 5,76+4,8x-0,05x=6.99x-1,995x+5,13
2)1 4/5x-2 1/2-2=-2 1/3-1/6-1/5
3) (3x-7)(5x+2)=0
4) 0.9(x-5)+2/5(6-x)=2/5+0.3(x+20)-0.2x
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