Question

Quanto é?
x+6=27
y+7=6
-2x=8
x-5=7
n=5
3

Answer 1

x + 6 = 21

x = 21 - 6

x = 15

y + 7 = 6

y = 6 + 7

y = 15

-2x = 8

- x =  8/2

- x = -4   . (-1)

x = 4

x - 5 = 7

x = 7 + 5

x = 12