Question

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

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

13+4(2x-1)=5(x+2)

4(x+5)+3(x+5)=21

ajudem!!!

Answer 1

a) 2( x + 1 ) - ( x - 1 ) = 0
2x + 2 - x + 1 = 0
2x - x = 0 - 2 - 1
x = - 3
b) 5 ( x + 1 ) - 3 ( x + 2) = 0
5x + 5 - 3x - 6 = 0
5x - 3x = 0 - 5 + 6
2x = 1
x = 1/2
c) 13 + 4 ( 2x - 1 ) = 5 ( x + 2 )
13 + 8x - 4 = 5x + 10
8x - 5x = 10 - 13 + 4
3x = 1
x = 1/3
d) 4 ( x + 5 ) + 3 ( x + 5 ) = 21
4x + 20 + 3x + 15 = 21
4x + 3x = 21 - 20 - 15
7x = 6
x = 6/7