I need help plz plz plz

How do you multiply a mixed fraction by a regular fraction

Which is the most efficient first step to solve x in the equation 3.7x - 18 = -4.3x -34 a. add 3.7x to both sides of the equation. b. add 4.3x to both sides of the equation. c. subtract 18 from both sides of the equation. d. subtract 34 from both sides of the equation.

Given abcd ac=38 and ae=3x+4 find the value of x