Question

решите уравнения :
а) 2(x+1.2)=2.7-x
б) 7/9x-518x=-3

Answer 1

а) 2(x+1.2)=2.7-x
    2x+2.4=2.7-x
    3x=0.3
    x=0.1
б) 7/9x-518x=-3
    3=518x-7/9x
    3=x(518-7/9)
    3=x((518*9)/9-7/9)
    3=x((4662-7)/9)
    3=x(4655/9)
    27=4655x
    x=27/4655