\(a,\left(-2\right).\left(-9\right)=3x\\ 3x=18\\ x=6\\ b,\dfrac{x}{24}=\dfrac{5+4}{12}\\ \dfrac{x}{24}=\dfrac{3}{4}\\ 4x=24.3\\ 4x=72\\ x=18\\ e,4x+21=73\\ 4x=73-21\\ 4x=52\\ x=13\\ f,\left(-5\right).\left(x+1\right)=25.3\\ -5x-5=75\\ -5x=80\\ x=-16\)
Đúng 2
Bình luận (1)