Question

Calcule a solução a seguir:
a) 5x-=2x+3
b)7(x+2)=-6
c) 2x+1=3
 ¯¯¯¯¯¯¯¯
     3
d) 3x+2 = x-1
    ¯¯¯¯   ¯¯¯¯
     5          4

Answer 1

a) 5x-=2x+3
5x-2x =3
3x= 3
x= 3/3
x= 1
S:{1}

b)7(x+2)=-6
7x +14 = -6
7x = -6 -14
7x= -20
x= -20/7
S:{-20/7}

c) (2x+1)/3=3
2x +1= 3.3
2x +1= 6
2x= 6-1
x= 5
x= 5/2  ou 2,5
S:{ 5/2 ou 2,5}


d) (3x+2)/5= (x-1)/4
4.(3x +2) = 5.(x-1)
12x +8 = 5x -5
12x -5x= -5 -8
7x= -13
x= -13/7
S:{-13/7}