Question

give me answer both questions​

Answer 1

4

$4 \times 3 \div 4 - 5 \div 7z = - 3 \div 20 \ \\ 3 - 5 \div 7z = - 3 \div 20 \\ 21z - 5 \div 7z = - 3 \div 20 \\ 420z - 100 = - 21z \\ 399z = 100 \\ z = 0.25$