Question

1- Calcule as equações: a)3x+2x-5=100. b)3x+9=2x-40. c)3(x+2)+2=-10. d)5(9+x)-10=4(x-2)

Answer 1

Olá,

Vamos lá,

a)3x+2x-5=100
3x + 2x = 100 + 5
5x = 105
x = 105/5
x = 21

b)3x+9=2x-40
3x - 2x = -40 -9
x = - 49

c)3(x+2)+2=-10
3x + 6 + 2 = -10
3x = -10 -6-2
3x = - 18
x = -18/3
x = - 6

d)5(9+x)-10=4(x-2)
45 + 5x -10 = 4x - 8
5x - 4x = -8 - 45 +10
x = -43

Answer 2

a) 3x+2x-5=100
5x= 100 + 5
5x= 105
x= 105/5= 21

R: 21

b) 3x+9=2x-40
3x - 2x= -40 - 9
x= -49

R: -49

c) 3(x+2)+2=-10
3x + 6 + 2= -10
3x= -10 -6 -2
3x= -18
x= -18/3= -6

R: -6

d) 5(9+x)-10=4(x-2)
45 + 5x -10= 4x -8
5x -4x= -8 -45 +10
x= -43

R: -43