Question

1)resolva:

a)9x-7=5×+13

b) 2(2×-1)+6 (1-2×)=2(4×-5)

c) 3×-2=×-5
4 3 2

d) 5=5-3×
7


e) 2×+3- 4×-9= 3-4×
3 6 2

Answer 1

a)9x-7=5×+13
9x-5x=13+7
4x=20
x=20/4
x=5

b) 2(2×-1)+6 (1-2×)=2(4×-5)
4x-2+6-12x=8x-10
4x-12x-8x=-10+2-6
-16×=-14 ×(-1)
x=14/16 fatore por 2
x=7/8

c) 3×-2=×-5
3x-x=-5+2
2x=-3
x=-3/2

d) 5=5-3×
3x=5-5
3x=0/5
x=0/5
x=0

e) 2×+3- 4×-9= 3-4×
2x-4x+4x=3-3+9
2x=9
x=9/2
x= 4.5

Espero ter ajudado!