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a fost răspuns

Rezolvati ecuatiile:
1. 4x+5=x-1
2. 9x+8=8
3. 2(x+7)-15=2x-1

Răspuns :

1. 4x+5=x-1

4x-x= -1-5

3x= -6

x= -6:3

x= -2

2. 9x+8=8

9x=8-8

9x=0

x=0

3. 2(x+7)-15=2x-1

2x+14-15=2x-1

2x-1=2x-1

2x-2x= -1+1

0x=0⇒ x∈R

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