Question

Resolva as equações

A 7(x-1)-2(x-5)=x-5

B 2 (x-1)=3x+4

C 3(5-x)-3(1-2x)=42

Answer 1

A) 7X - 7 - 2X +5 = X -5      
7X - 2 X - X = -5 + 7  
4X  =2
X = 1/2
 
B) 2X -2 = 3X + 4
-2 - 4 = 3X - 2X
-6 = X

C) 15 - 3X - 3 + 6X = 42
-3X + 6X = 42 -15 + 3
3X = 30
X = 10

Answer 2

A)7x-7-2x+10=x-5 
7x-2x-x=-5+7-10 
7x-3x=12-10 
4x=2 
x=2/4 
x=0,5 

B)2x-2=3x-4 

2x-3x=4+2 

-x=6 

x=-6 
   

c)15 - 3x - 3 + 6x = 42-3x + 6x = 42 - 15 + 3
3x = 30
x = 30/3
x = 10