Question

Determine mentalmente as raizes das equaçoes
3-x=0
3x-1=0
x=2
8
X-18=0
5x=-20
-4x=32

Answer 1

3-x=0
3-0=x
3=x

3x-1=0
3x= 0+1
x= 1/3

x=2

8

x-18=0
x= 18

5x= -20
x= -20÷5
x= -4

-4x= 32
x= 32/-4
x= -8