Пожалуйста решите1)...

1)
$(27.9 - x) \div 6.5 = 3.8 \\ 27.9 - x = 3.8 \times 6.5 \\ 27.9 - x = 24.7 \\ x = 27.9 - 24.7 = 3.2$
2)
$4 \times (9.6x - 3.2) = 6.4 \\ 9.6 x- 3.2 = 6.4 \div 4 \\ 9.6x - 3.2 = 1.6 \\ 9.6x = 1.6 + 3.2 \\ 9.6x = 4.8 \\ x = \frac{4.8}{9.6} = 0.5$
3)
$28.98 \div (m - 13.2) = 4.6 \\ m - 13.2 = \frac{28.98}{4.6} \\ m - 13.2 = 6.3 \\ m = 6.3 + 13.2 = 19.5$
4)
$6.3m + 18.76 = 79.87 \\ 6.3m = 79.87 - 18.76 \\ 6.3m = 61.11 \\ m = \frac{61.11}{6.3} = 9.7$
5)
$(k - 45.6) \times 5.2 = 65.52 \\ k - 45.6 = \frac{65.52}{5.2} \\ k - 45.6 = 12.6 \\ k = 12.6 + 45.6 = 58.2$
6)
$6.3 + (y - 8.2) = 8 \\ y - 8.2 = 8 - 6.3 \\ y - 8.2 = 1.7 \\ y = 1.7 + 8.2 = 9.9$
7)
$(m + 2.3) \div 6.7 = 8.4 \\ m + 2.3 = 8.4 \times 6.7 \\ m + 2.3 = 56.28 \\ m = 56.28 - 2.3 = 53.98$
8)
$72 \div (1.5a + 1.7) = 3.6 \\ 1.5a + 1.7 = \frac{72}{3.6} \\ 1.5a + 1.7 = 20 \\ 1.5a = 20 - 1.7 \\ 1.5a = 18.3 \\ a = \frac{18.3}{1.5} = 12.2$
9)
$(43.6 + k) \div 2.4 = 26.5 \\ 43.6 + k = 26.5 \times 2.4 \\ 43.6 + k = 63.6 \\ k = 63.6 - 43.6 = 20$
10)
$a \div 2.4 - 15.6 = 2.4 \\ a \div 2.4 = 2.4 + 15.6 \\ a \div 2.4 = 18 \\ a = 18 \times 2.4 = 43.2$