Question

se alguém ai quer pontos preciso de ajuda nessa tbm

Answer 1

1)
x+9=15
x=15-9
x=6

2)
x-x/2=15
2x-x=30
x=30

3)
x-1+x+x+1=345
3x=345
x=345/3
x=115
114, 115, 116

4)
x-2+x+x+2=369
3x=369
x=369/3
x=123
121, 123, 125

5)
x/2+x/3+20=x
3x+2x+120=6x
5x+120=6x
x=120

6)
3x/5+x=40
3x+5x=200
8x=200
x=25

7)
x-10+x=52
2x-10=52
2x=62
x=31

8)
x+3x=1
4x=1
x=1/4
25 cm e 75 cm