Răspuns :

Mihaelapid
A) 3x + 4 = 4x + 3
3x - 4x = 3 - 4
x = 1
c) x - 5 + 2x + 22 = 20
3x = 20 + 5 - 22
3x = 3
x = 1
Pgabrielacasandid
a)15x+20=20x+15
20x-15x=20-15=5
5x=5
x=5:5=1
b)7*x*x-8x+1=0
14x+8x+1=0
22x+1=0
22x=0-1=-1
x=22:(-1)=-22
c)(x-5)+2x+22=20
3x=20+5-22
3x=3
x=3:3=1

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