Hallijarrell56id Hallijarrell56id Mathematics Answered Please answer all quistion and show your work. 16. 4a – 8 = 28 17. 5x – 2x = 15 18. 3(-4x + 7) = 57 19. 19 – 8x = x – 17 20. 5 + x÷8 = -4