Question

Помогите пожалуйста дам 18б.

Answer 1

3) -2(4y - 2x) + (y^2 - 3x) - y(y - x + 7) = -8y + 4x + y^2 - 3x - y^2 + xy - 7y = -8y + 4x - 3x + xy - 7y = xy - 15y + x

6)
$frac{2x + 1}{6} = frac{7x - 3}{12} + 1 \ frac{2(2x + 1)}{12} = frac{7x - 3}{12} + frac{12}{12} \ frac{4x + 2}{12} = frac{7x + 9}{12} \ 4x + 2 = 7x + 9 \ 7x - 4x = 2 - 9 \ 3x = - 7 \ x = - frac{7}{3} = - 2frac{1}{3}$