Question

aflas-l pe z din egalitatea
z+z+z=91-37

Answer 1

z + z + z = 91 - 37

3z  = 54 

z = 54 : 3

z = 18

Answer 2

$\it z+z+z=91-37 \\ \\ \it 3z=54 \\ \\ \it z=54:3 \\ \\ \it z=18$