Question

resolvam por favor!!!!!
a) 3x-(x + 1) = -x + 1

b) 2(2x+5) - (4x - 9) = 3(3 - 4x)

c) 9x - 20 = 8(x - 1)

d) 4(x - 2) = 4 + 2(x - 1)

Answer 1

a
3x - ( x + 1 ) = -x + 1
3x - x - 1 + x - 1 = 0
3x - 2 = 0
3x = 2
x = 2/3 ****
b
2 ( 2x + 5) - ( 4x - 9 ) =  3 ( 3 - 4x )
4x + 10 - 4x + 9 = 9 - 12x
19 - 9 + 12x = 0
12x + 10 = 0
12x = - 10
x = -10/12 = - 5/6 ***
c
9x - 20 = 8 (  x - 1)
9x - 20 = 8x - 8
9x - 8x = -8 + 20
x = 12 *****
d
4 ( x - 2) = 4 + 2 ( x - 1)
4x - 8 = 4 + 2x - 2
4x - 2x - 8 - 4 + 2 = 0
2x - 10 = 0
x - 5 = 0
x = 5 ****