Answer:
d = 3
Step-by-step explanation:
[tex]\frac{2}{5}[/tex] d - [tex]\frac{3}{10}[/tex] = [tex]\frac{9}{10}[/tex] [ note + - = - ]
multiply through by 10 ( the LCM of 5 and 10 ) to clear the fractions
4d - 3 = 9 ( add 3 to both sides )
4d = 12 ( divide both sides by 4 )
d = 3
