Question

5×-3(×-4)=4(×+2)+2(9-2×)

3(×-3)+4(×-1)=12(×-4)

4(30+×)=5(20+×)

3(9+×)=2(19-×)

3(21-×)=2(23-×)​

Answer 1

Respuesta:

$5x - 3(x - 4) = 4(x + 2) + 2(9 - 2x) \\ 5x - 3x + 12 = 4x + 8 + 18 - 4x \\ 2x + 12 = 26 \\ 2x = 26 - 12 \\ 2x = 14 \\ x = 7$

$3(x - 3) + 4(x - 1) = 12(x - 4) \\ 3x - 9 + 4x - 4 = 12x - 48 \\ 7x - 13 = 12x - 48 \\ - 13 + 48 = 12x - 7x \\ 35 = 5x \\ 7 = x$

$4(30 + x) = 5(20 + x) \\ 120 + 4x = 100 + 5x \\ 120 - 100 = 5x - 4x \\ 20 = x$

$3(9 + x) = 2(19 - x) \\ 27 + 3x = 38 - 2x \\ 3x + 2x = 38 - 27 \\ 5x = 11 \\ x = \frac{11}{5}$

$3(21 - x) = 2(23 - x) \\ 63 - 3x = 46 - 2x \\ 63 - 46 = - 2x + 3x \\ 17 = x$