Maths help me maths giving 12 point

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.

1. what is the measure of ∠abc? what is the measure of ∠abd?

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).