Решите уравнения: а) [latex]3*(0,4x + 1,4) = x - 0,8[/latex] б)[latex]3x + 1 \frac{2}{9} = x - 3 \frac{10}{27} [/latex]

3*(0.4x  + 1.4) = x - 0.8 1.2x + 4.2 = x - 0.8 1.2x - x = -0.8 - 4.2 0.2x  = -5 x = -5 / 0.2 x = -25 ======= 3x + 1  2/9 = x - 3 10/27 | * 27 27 * 3x + 11/9 * 27 = 27* x  - 91/27 * 27  81x + 33 = 27x - 91 81x - 27x = -91 - 33 54x = -124 x = -124 / 54 x = - 2   16/54 x = - 2   8/27

[latex]3(0.4x + 1.4) = x - 0.8 \\\ 1.2x + 4.2 = x - 0.8 \\\ 1.2x-x = - 0.8-4.2 \\\ 0.2x= - 5 \\\ x=- \frac{5}{0.2} \\\ x=-25[/latex] [latex]3x + 1 \frac{2}{9} = x - 3 \frac{10}{27} \\\ 3x -x= - 3 \frac{10}{27} - 1 \frac{2}{9} \\\ 2x= - \frac{91}{27} - \frac{33}{27} \\\ 2x= - \frac{91+33}{27} \\\ 2x= - \frac{124}{27} \\\ x= - \frac{124}{2\cdot27} \\\ x= - \frac{62}{27} \\\ x= -2 \frac{8}{27}[/latex]