Решите систему уравнений
2(3х+2у)+9=4 х+21
2х+10=3-(6х+5у)

2(3x + 2y) + 9 = 4x +212x + 10 = 3 - (6x + 5y)6x + 4y + 9 = 4x + 212x + 10 = 3 - 6x - 5y4y = -2x + 122x + 10 = 3 - 6x - 5yy = -0,5x + 32x + 10 = 3 - 6x - 5y2x + 10 = 3 - 6x - 5(-0,5x + 3)2x + 10 = 3 - 6x + 2,5x - 155,5x = -22x = -4.y = 2 + 3y = 5

ответ: (-4;5).