Question

Preciso de ajuda nessa equações!!
/a) 4 (x +5) +3 (x+5) = 21
b) 2(x + 5) - 3 ( 5 - x ) = 10
c) 8 (x-1) = 8-4(2x-3)
d) 5x-7= 1 + x
2 2
e) x + 3x -2 = x-3
4 2 2
f) 2 ( x - 1 ) = 3x + 6
3 5

Answer 1

a) 4(x+5)+3(x+5)=21

4x+20+3x+15=21

4x+3x=21-20-15

7x=21-35

7x=14

x=14/7

x=2

b) 2(x+5)-3(5-x)=10

2x+10-15+3x=10

2x+3x=10-10+15

5x=0+15

5x=15

x=15/5

x=3

c) 8(x-1)=8-4(2x-3)

8x-8=8x-12

8x-8x=-12+8

0=-4

x=0

d) 5x-7=1+x

5x-x=1+7

4x=8

x=8/4

x=2

e) x+3x-2=x-3

x+3x-x=-3+2

3x=-1

x=3/-1 (×-1)

x=-3

f) 2(x-1)=3x+6

2x-2=3x+6

2x-3x=6+2

-x=8 (×-1)

x=-8