Question

d)5b-110+2b=4b-20?

e)-4+x=2?

f)4×(x-2)=4+2(x-1)?

g)9x-20=8(x-1)?

h)10(x-1)-7(x+1)=4?

i)0,3b+2=10?


j)5a-1=4a-8?


??​

Answer 1

Resposta:

d)7b-110=4b-20

7b-4b=-20+110

3b=90

b=90/3

b=30

e)x=2+4

x=6

f)4x(x-2)=4+2(x-1)

4x2-8=6(x-1)

4x2-8=6x-6

4x2-6x=-6+8

4x2-6x=2

g)9x-20=8(x-1)

9x-20=8x-8

9x-8x=-8+20

x=12

h)10x-10-7x-7=4

3x-17=4

3x=4+17

3x=21

x=21/3

x=7

i)0,3b+2=10

0,3b=10-2

0,3b=8

b=8/0,3

b=26,66...

j)5a-1=4a-8

5a-4a=-8+1

a=-7