Question

Помогите пожалуйста
7x-20=4x+16
y-(5y-2,5)=-0,5+(2y+15)
1,2(5x-8)=0,5(7x+2)

Answer 1

Объяснение:

$7x - 20 = 4x + 16 \\ 7x - 4x - 20 = 16 \\ 7x - 4x = 16 + 20 \\ 3x = 16 + 20 \\ 3x = 36 \\ x = 12$

Ответ:, х=12

$y - (5y - 2.5) = - 0.5 + (2y + 15) \\ y - 5y + 2.5 = - 0.5 + 2y + 15 \\ - 4y + 2.5 = 14.5 + 2y \\ - 4y - 2y = 14.5 - 2.5 \\ - 6y = 14.5 - 2.5 \\ - 6y = 12 \\ y = - 2$

Ответ:у=-2

$1.2(5x - 8) = 0.5(7x + 2) \\ 6x - 9.6 = 3.5x + 1 \\ 6x - 3.5x = 1 + 9.6 \\ 2.5x = 1 + 9.6 \\ 2.5x = 10.6 \\ x = 4.24$

Ответ: х=4,24