Answer:
[tex]\huge\boxed{x=-\dfrac{7}{2}=-3.5}[/tex]
Step-by-step explanation:
[tex]3(-10x-3)+6x=75\qquad/\text{use the distributive property}\\\\(3)(-10x)+(3)(-3)+6x=75\\\\-30x-9+6x=75\qquad/\text{add 9 to both sides} \\\\(-30x+6x)-9+9=75+9\\\\-24x=84\qquad/\text{divide both sides by (-24)}\\\dfrac{-24x}{-24}=\dfrac{84}{-24}\\\\x=-\dfrac{84:12}{24:12}\\\\x=-\dfrac{7}{2}[/tex]
