Question

ajuda pleas?


1) 8.(x + 3) = 40
2) 12x – 14. (1 – x) – 2. (10x + 4) = 2
3) 10. (2x – 1) = 4 .(x + 4)
4) 4x – 6. (4 – x) = 10 + 8. (2x + 1)
5) 10x – 20 .(x – 1) = 40 – 30. (x – 2)
6) 2. (3x – 7) + 3 (x – 1) = 4 .(2x – 3)
7) 6. (x – 3) + 12 .(2x + 1) = 24 – 15. (x – 4)
8) 3 – 2 . (x + 3) = x – 18
9) 50 + 1. (3x − 8) = 2 . (3x – 4) + 26
10)3x – 2 .(20 – x) = 35

Answer 1

Faça a distribuição
1) 8x+24=40
8x= 40-24
8x=16
x=16/8 x=2

2) 12x-14+14x-20x-8=2
26x-20x=2+8+14
6x=24
x= 24/6 x=4

3) 20x-10=4x+16
20x-4x=16+10
16x=26
x=26/16 (divide os dois por 2) x=13/8

4) 4x-24+6x=10+16x+8
10x-16x=18+24
-6x=42 (multiplica por -1 nos dois lados para o X não ficar negativo)
6x=-42
x=-42/6 x=-7

5)10x-20x+20=40-30x+60
-10x+30x=100-80
20x= 80
x=80/20 x=4

6) 6x-14+3x-3=8x-12
9x-8x=-12+17
x=5

7)6x-18+24x+12=24-15x+60
30x+15x=24+60+6
45x=90
x=90/45 x=2

8) 3-2x-6=x-18
-2x-x=-18+3 (.-1) os dois lados p o x ficar positivo
3x=18-3
3x=15
x=15/3 x=5

9) 50+3x-8=6x-8+26
3x-6x=26-50
-3x=-24 (.-1)
x=24/6 x=8

10) 3x-40+2x=35
5x=35+40
5x=75
x=75/5 x=15