15 + x - 14 = 36
x - 14 = 36 - 15
x - 14 = 21
x = 21 + 14
x = 35
15 + x - 14 = 36
x = 36 - 15 + 14
x = 21 + 14
x = 35
15 + x - 14 = 36
x - 14 = 36 - 15
x - 14 = 21
x = 21 + 14
x = 35
Vậy số x cần tim bằng 35
15+x-14=35
=>15+x=36+14
=>15+x=50
=>x=50-15
=>x=35
15 + x = 36 + 14
15 + x = 50
x = 50 - 15
x = 35
15 + x - 14 = 36
15 + x = 36 + 14
15 + x = 50
x = 50 - 15
x = 35