Question

equaçoes com parenteses 3(5-x)-3(1-2x)=42

7(x-5)=3(x+1)
3(x-2)=4(-x+3)
2(x+1)-1(x-1)=0
5(x+1)-3(x+2)=0

Answer 1

3(5-x)-3(1-2x)=42
15-3x-3+6x=42
-3x+6x=42-15+3
3x=30
x=10

7(x-5)=3(x+1)
7x-35=3x+3
7x-3x=3+35
4x=38
x=9,5

3(x-2)=4(-x+3)
3x-6= -4x+12
3x+4x=12+6
7x=18
x=18/7

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

5(x+1)-3(x+2)=0
5x+5-3x-6=0
5x-3x=6-5
2x=1
x=1/2

Answer 2

3(5-x)-3(1-2x)=42
15-3x -3 +6x =42
-3x+6x =42+3-15
3x=30
x=10

7(x-5)=3(x+1)
7x-35 = 3x +3
7x-3x = 3 +35
4x = 38
x = 38/4
x= 9,5

3(x-2)=4(-x+3)
3x-6=-4x +12
3x +4x =12+6
7x=18
x= 18/7
x=2,57

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

5(x+1)-3(x+2)=0
5x+5-3x+6=0
5x-3x=0+6-5
2x=1
x = 1/2 ou 0,5