0.3 * (3x - 4y) - 5 * (0.2 - y), если x = -8.6; y = 0.3

0.3 * (3x - 4y) - 5 * (0.2 - y)= 0,9x - 1,2y - 1 + 5y = 0,9x + 3,8y - 1=0,9*(-8,6) + 3,8*0,3 - 1 = -7,74 + 1,14 - 1 = -7,6