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a) 2x-3=19
b) 5x-2=3x+12
c)2x+1 = x-1
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5 2


Răspuns :

b) 5x-2=3x+12
5x-3x=12+2
2x=14
x=14:2
x=7

c) 2x+1=x-1
2x-x=-1-1
x=-2
A) 2x-3=19
2x=19+3
2x=22
x=22:2
x=11

b)5x-2=3x+12 (separam termeni cu x intr-o parte , iar ceilalti isi schimba semnele)
⇒5x-3x=12+2
2x=14
x=14:2
x=7

c)2x+1=x-1 (la fel ca la b separam termeni cu x)
2x-x=1+1
x=0