Question

Resolva as equações de primeiro grau:
a) 20=-6x+32
b) 9x+15=4x
c) 11-2(x+6)=8+3(2x+5)

Answer 1

a)

20=-6x+32

6x=32-20

6x=12

x=12/6

x=2

b)

9x+15=4x

9x-4x=-15

5x=-15

x=-15/5

x=-3

c)

11-2(x+6)=8+3(2x+5)

9(x+6)=11(2x+5)

9x+54=22x+55

9x-22x=55-54

-13x=1 (-1)

13x=-1

x=-1/13

Answer 2

b) 9x +15 = 4x
9x- 4x = - 15
5x = - 15

x = - 5/15 (simplifica por 5)

x = - 1/3 (ou -3)