Question

Ajudem ai,por favor!

Answer 1

a)
3x+1=5+x
3x-x = 5-1
2x= 4
x= 4/2 = 2

b)
3-x = 5x- 15
-5x-x= -3-15
-6×= -18 ×(-1)
6x=18
x= 18/6= 3

c)
x-3 = 6+4x
x-4x = 6+3
3x = 9
x = 9/3 = 3

d)
3x+6 = x+6
3x-x = 6-6
2x= 0

e)
4x-3-x+8 = 11
4x-x = 11-8+3
3x= 6
x= 6/3 = 3

f)
x+15 = 4x+3
x-4x = -15 +3
-3x = -12 ×(-1)
3x = 12
x = 12/3 = 4