x+7=12 => 12-7=5
x-6=14 x = 14+6=20
2x=22 x = 22/2=11
2x-1=23 x = 23+1=24 = 24/2=12
3x+1=34 3x = 34-1=33 x = 33/3=11
4x-1=15 4x= 15+1=16 => x=16:4=4
2*(x-1)=4 x-1=2 =>x=3
2x+1=x+7 => 2x-x=7-1 => x=6
3x-1=4x-6 = >-4x+3x=-6-1=-5
5x+1=3x+9 > -1x=-5 x =+5
էրիկ Օհանյանի բլոգ 