Question

2x+10=30
x-4=-23
2x-25=75
x+1=+9
x-2x=-21

Answer 1

Oi,

Resolução

2x+10=30
2x = 30 - 10
2x = 20
x = 10

x-4=-23
x = - 23 + 4
x = - 19

2x-25=75
2x = 75 + 25
2x = 100
x = 50

x+1=+9
x = 9 - 1
x = 8

x-2x=-21
- x = - 21 . (-1)
x = 21

Espero ter ajudado e bons estudos !

Answer 2

2x=30-10
2x=20
x=20/2
x=10

x=-23+4
x=-19

2x=75+25
2x=100
x=100/2
x=50

x=9-1
x=8

-x=-21*(-1)
x=21