\(\dfrac{3x}{7}+1=-\dfrac{1}{28}\times\left(-4\right)=\dfrac{1}{7}\)
\(=>\dfrac{3x}{7}=\dfrac{1}{7}+1=\dfrac{8}{7}\)
\(=>3x=8=>x=\dfrac{8}{3}\)
a. \(\left(\dfrac{3x}{7}+1\right):\left(-4\right)=-\dfrac{1}{28}\\\left(\dfrac{12x}{7}+\dfrac{28}{28}\right):\dfrac{-112}{28}=-\dfrac{1}{28} \\ 12x+28:-112=-1\\ 12x-0,25=-1\\ 12x=-0,75\\ x=-0,0625\)
=>3/7x+1=1/7
=>3/7x=-6/7
hay x=-2
\(\left(\dfrac{3x}{7}+1\right):\left(-4\right)=\dfrac{-1}{28}\)
\(\dfrac{3x}{7}+1=\dfrac{-1}{28}.\left(-4\right)\)
\(\dfrac{3x}{7}+1=\dfrac{1}{7}\)
\(\dfrac{3x}{7}=\dfrac{1}{7}-1\)
\(\dfrac{3x}{7}=\dfrac{-6}{7}\)
\(x=\left(-6\right):3\)
\(x=-2\)
