Question

x+5=3x+20

(-1) + 1=0 -1+1=0 0=0



a) x-5=8
b) b3x+6=12
C) 2=7y-5
D) 5c+2=3-9



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Answer 1

1)

x + 5 = 3x + 20
5 - 20 = 3x - x
- 15 = 2x
2x = - 15
x = - 15/2

2)

= (-1) + 1=0
= -1+1 = 0
0 = 0   (ok)
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a)

x - 5 = 8
x = 8 + 5
x = 13

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b)

3x + 6 = 12
3x = 12 - 6
3x = 6
x = 6/3
x = 2

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c)

2 = 7y - 5
2 + 5 = 7y
7 = 7y
7y = 7
y = 7/7
y = 1

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d)

5c + 2 = 3 - 9
5c + 2 = - 6
5c = - 6 - 2
5c = - 8
c = - 8/5

Answer 2

x+5=3x+20 --> x-3x=20-5 --> -2x=15 --> x=15/-2 --> x=-7,5

a)x-5=8 --> x=8-5 -->x=3

b)3x+6=12 --> 3x=12-6 --> 3x=6 --> x=6/3--> x=2

c)2=7y-5--> 2+5=7y --> 7=7y --> y=7/7--> y=1

d)5c+2=3-9 --> 5c=-6-2 --> 5c=-8 --> c=-8/5 ou c=1,6