Question

Resolva as seguintes equações,sendo U=Q

A)7(x - 5) = 3 (x + 1) = { }

eu n entendi ;-;

Answer 1

A)
7.(x - 5) = 3 (x + 1) = { } 

7x - 35 = 3x + 3
7x - 3x = 3 + 35
4x = 38
x =   38  (:2)
       -------
          4  (:2)

x =   19
       -------
          2

Answer 2

a)7(x-5)=3(x+1)
7x-35=3x+3
7x-3x=3+35
4x=38
x=38/4
x=9.5

b) 3x-6= -4x+12
3x+4x=12+6
7x=18
x=18/7
x=2.57

c) 2x +2 -x+1=0
x=-1-2
x= -3

d)5x+5-3x-6=0
2x-1=0
x=1/2 ou 0.5

e)13+4(2x-1)=5(x+2)
13+8x-4=5x+2
8x-5x=2+4-13
3x=7
x=7/3
x=2.333333

f) 4x+20+3x+6=21
7x=-1+6
x=5/7
x=0.7

g)2x+10-15+3x=10
5x=-10+15+10
X=15/5
X=3

h)8(x-1)=8-4(2x-3)
8x-8=8-8x+12
x=12