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=5/6 5/12x = 5/6 - 3/4 5x = 12 *( 5 * 2 - 3 * 3) / 12 x = 1 / 5 4.72-2.5x=2x+2.92 -2.5x - 2x = 2.92 - 4.72 -4.5x = -1.8 x = (18 / 10) / (45 / 10) x = 18 /45 x = 2 / 5 = 0.4 5/8y-3/4=2y-12/5 5/8y - 2y = -12/5 + 3/4 -11/8y = (-4 * 12 + 15) / 20 -11/8y = -33/20 y = (33 * 8) /(20 * 11) y = 6 / 5 = 1.2 4(1-0.5a)= -2(3+2a) -2(1 - 0.5a) = 3+ 2a -2 + a = 3 + 2a -a = 5 a = -5