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x+20=7x-4
x+24+7x
24=6x
x=4
1
x-12+20x=-12+21x
21x-12=21x-12
21x-21x=-12+12
0=0
3x-1=5x
3x-5x=1
-2x=1/:(-2)
x=-1/2
y-3=9-y
y+y=9+3
2y=12/:2
y=6
1/2z+6=z-1
1/2z-z=-1-6
-1/2z=-7/:(-1/2)
z= 14
zad2. ta liczba to 4.
x*7-4=x+20
7x-4=x+20
6x=24/:6
x=4
sprawdzenie
4*7=28
28-4=4
4+20 = 24