Помогите пожалуйста решить уравнения! Пожалуйстааа!

1) (8х-4)*(4х+0,4)=0

2) -5(1-х)=2(х-8)

3)-0,4*(-1/2+3ó)=2,6+5,9

4)8*(0,7х-4)-2*(0,2-3)=-39
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