Question

E) {- 3x +2. [45 - x-3 (3x + 7) - 2x] + 4x} =55

Answer 1

ko chép lại đề bài

<=> {(-3x+4x)+2[ 45-(x+2x)-9x-21]}=55

<=> {x+2[(45-21)-(3x+9x)]}=55

<=> x+2[24-12x]=55

<=> x+48-24x=55

<=> 48-23x=55

<=>23x=48-55=-7

<=>x=\(\frac{-7}{23}\)