Pls help its for a test and I promise ill give brainiest

Empty box + box + empty box fill in the box is equal to 30 how

What is the value of x in the following equation? -3x-2=2x+8

Find the power set of each of these sets, where a and b are distinct elements. a) {a} b) {a, b} c) {1, 2, 3, 4} show steps