Question

resolva as seguintes equação do 1grau sendo u=r a)x-3=10 b)-2x+11=15 c)5x-12=2x d)-7x+1=-6 e)7x-20=6x-17

Answer 1

a) x-3=10
x=3+10
x= 13

b) -2x+11=15
-2x=15-11
-2x=4
x=4/-2
x=-2

c) 5x-12=2x
5x-2x-12=0
3x-12=0
3x=12
x=12/3
x=4

d)-7x+1=-6
-7x=-6-1
-7x=-7
x=-7/-7
x= 1

e) 7x-20=6x-17
7x-6x=-17+20
x=3

Answer 2

a) 
x - 3 = 10
x = 10 + 3
x = 13

*********************
b)
- 2x + 11 = 15
- 2x = 15 - 11
- 2x = 4 (-1)
2x = - 4
x = -4/2
x = - 2

*********************
c) 
5x - 12 = 2x
5x - 2x = 12
3x = 12
x = 12/3
x = 4

*********************
d)
- 7x + 1 = - 6
- 7x = - 6 - 1 
- 7x = - 7 (-1)
7x = 7
x = 7/7
x = 1

************************
e)

7x - 20 = 6x - 17
7x - 6x = - 17 + 20
x = 20 - 17
x = 3

****************************************