Question

a) 2x+1 / 10 = -21 / 30
b)3x + 2 / x + 3 = -40 / 25
c) 0,3/x = -6/9
d) 7x + 5 /4 = 2x/3/4

Answer 1

A)     2x+1/10 =-21/30

 30.(2x+1)= -21.(10)

60x+30=-210

60X=-210-30

X=-240/60

X=-4

B) 3x+2/x+3=-40/25

25.(3x+2)=-40.(x+3)

75x+50=-40x-120

75x+40x=-50-120

x=170/115

C) 0,3/x=-6/9

-6x=2,7

x= -0,45

D) 7x+5/4=2x/3/4

7x+5/4=2x.(4)/1.(3) na multiplicação inverte a fração 3/4 fica 4/3

7x+5/4=8x/3 faz mmc de 4 e 3 =12

84x+15/12 = 32x/12

84x-32x=-15

x=-15/52