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2
a) x+(x+1)= 29
X+X+1=29
2X+1=29
2X=29-1
2x=28
x=28/2
x=14 RTA
b) 9x+[-(4x+1)]= -2x+(3-3x)
9X+[-4X-1]=-2X+3-3X
9X-4X-1=-5X+3
5X-1=-5X+3
5X+5X=3+1
10X=4
X=4/10
X=2/5 RTA
saludos!
la 2:
a) x +(x+1)= 29
2x +1=29
2x = 28
x = 14
b)9x-4x-1 = -2x+3-3x
5x - 1 = -5x +3
10x = 4
x = 4/10
x = 2/5 = 0,4
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