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ahora si .. compraré otra cámara xd
21 + 6 = 3x - 2x
27 = x
b)12(x - 2) = 1 - x
12x - 24 = 1 - x
12x + x = 1 + 24
13x = 25
x = 25/13
c) x + 5x - 4 = 18 - 2x
6x - 4 = 18 - 2x
6x + 2x = 18 + 4
8x = 22
x = 11/4
d) 3x - 2 + 7x = 7 - 1
3x - 2 + 7x = 7 - 1
10x - 2 = 6
10x = 6 + 2
10x = 8
x = 4/5
e) 4(2x + 3) - 2x = 4x + 20
8x + 12 - 2x = 4x + 20
6x + 12 = 4x + 20
6x - 4x = 20 - 12
2x = 8
x = 4
f) 34 = 3x - 6 + 2x
34 = 5x - 6
34 + 6 = 5x
40 = 5x
40/5 = x
8 = x