Página 159:
1º) 4x-1=7
4x = 8 → x = 2 x=2
2º) 2-5x=12
–5x = 10 → x = –2 x=-2
3º) 4-3x=4
–3x = 0 → x = 0 x=0
4º) 5x+3=3
5x = 0 → x = 0 x=0
5º) 11=5+4x
4x = 6 → x = 3 x= 3
2 2
6º) 0=21-7x
7x = 21 → x = 3 x=3
7º) 13x-5-6x=9
7x = 14 → x = 2 x=2
8º) 6-x=3-4x
3 = –3x → x = –1 x=-1
9º) 2x-5+x=1+3x-6
3x – 5 = 3x – 5 Infinitas soluciones
0 = 0
10º) 1-8x+5=11-3x
6 – 8x = 11 – 3x → 5x = –5 → x = –1 x=-1
11º) 7x+2x=2x+1+6x
9x = 8x + 1 → x = 1 x=1
12º) 2x+8-9x=7+2x-2
–7x + 8 = 2x + 5 → 9x = –3 → x = – 1 x=- 1
3 3
13º) 10-15x+2=10x+5-11x
12 – 15x = 5 – x → 14x = 7 → x = 1 x= 1
2 2
14º) 3-(1-6x)=2+4x
2 + 6x = 2 + 4x → x = 0 x=0
15º) 3(x-1)-4x=5-(x+7)
3x – 3 – 4x = 5 – x – 7 → –x – 3 = –2 – x → –3 = –2 No tiene solución
16º) 2x-2(x-1)+5=4-3(x+1)
2x – 2x + 2 + 5 = 4 – 3x – 3 → 7 = 1 – 3x → –3x = 6 → x = – 6 = –2 x= -2
3
17º) 5(2x-3)-8x=14x-3(4x+5)
10x – 15 – 8x = 14x – 12x – 15 → 2x = 2x → 0 = 0 Infinitas soluciones
18º) 3(x-2)-5(2x-1)-2(3x+4)+10=0
3x – 6 – 10x + 5 – 6x – 8 + 10 = 0 → –13x + 1 = 0 → x = 1 x= 1
13 13
19º) 5x-2(3x-4)=25-3(5x+1)
5x – 6x + 8 = 25 – 15x – 3 → –x + 8 = 22 – 15x → 14x = 14 → x = 1 x=1
20º) 3(4x-1)-2(5x-3)=11-2x
12x – 3 – 10x + 6 = 11 – 2x → 2x + 3 = 11 – 2x → 4x = 8 → x = 2 x=2
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