-5 + 2 ( x - 3 ) = (1 + 8x) + 5x multi step equation need help

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.

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Which table represents a linear function? i'll give brainliest to first answer ^'^