Question

Gente preciso de ajuda!!
1)Resolva as equações:
a)2(x-6)+3(5+x)=0
b)11+2x+5x-x+3=+2
c)3(x-2)-5(x-1)=-7
d)5(3-x)-4x=18
e)x+x+x=87

Answer 1

a) 2(x-6)+3(5-x) = 0
¤¤2x - 6 + 15 - 3x = 0
¤¤- x + 9 = 0
¤¤- x = - 9 (-1)
¤¤x = 9

b) 11 + 2x + 5x - x + 3 = 2
¤¤14+ 6x - x =2
¤¤6x = 2 - 14
¤¤6x= -12
¤¤x = -12/6
¤¤x= -2

c) 3(x-2)-5(x-1)=-7
¤¤3x - 6 - 5x - 5 = -7
¤¤-2x - 11 = -7
¤¤-2x = - 7 + 11
-2x= -4 (-1)
2x = 4
x = 4/2
x = 2

d) 5(3-x) - 4x = 18
5x-15 - 4x =18
5x - 4x = 18 - 15
x = 3

e) x +x + x = 87
¤¤3x = 87
¤¤x = 87/3
¤¤x = 29