Hey there!
[?] - 3/10 = 1/5
x - 3/10 = 1/5
ADD 3/10 to BOTH SIDES
x - 3/10 + 3/10 = 1/5 + 3/10
CANCEL out: -3/10 + 3/10 because it gives you 0
KEEP: 1/5 + 3/10 because it helps solve for the x-value (also known as the unknown number)
NEW EQUATION: x = 1/5 + 3/10
SIMPLIFY IT!
x = 1/2
Your mystery number is: 1/2
Therefore, your answer should be: 1/2
Good luck on your assignment and enjoy your day!
~Amphitrite1040:)
