5/12x+3/4=5/6
4.72-2.5x=2x+2.92
5/8y-3/4=2y-12/5
4(1-0.5a)= -2(3+2a)
можно пожалуйста пошагово

5/12x+3/4=5/65/12x = 5/6 - 3/45x = 12 *( 5 * 2 - 3 * 3) / 12x = 1 / 54.72-2.5x=2x+2.92-2.5x - 2x = 2.92 - 4.72-4.5x = -1.8x = (18 / 10) / (45 / 10)x = 18 /45x = 2 / 5 = 0.45/8y-3/4=2y-12/55/8y - 2y = -12/5 + 3/4-11/8y = (-4 * 12 + 15) / 20-11/8y = -33/20y = (33 * 8) /(20 * 11)y = 6 / 5 = 1.24(1-0.5a)= -2(3+2a)-2(1 - 0.5a) = 3+ 2a-2 + a = 3 + 2a-a = 5a = -5