Question

реши уравнение 1,3+0,8=0,7а-1

Answer 1

1,3+0,8=0,7а-1
2,1=07, 2-1
2,1=07, 8

Answer 2

$1.3 + 0.8 + 1 = 0.7a \\0.7a = 3.1 \\ a = 3.1 \div 0.7 \\ a = \frac{31}{7} = 4 \frac{3}{7}$