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6x+8=4x+20 /-4x
2x+8=20 /-8
2x=12 /:2
x=6
Sprawdzenie:
6x+8=4x+20
6*6+8=4*6+20
36+8=24+20
44=44
b)
9y-11=6y+7 /-6y
3y-11=7 /+11
3y=18 /:3
y=6
Sprawdzenie:
9y-11=6y+7
9*6-11=6*6+7
54-11=36+7
43=43
c)
-5z+4=2z-10 /-2z
-7z+4= -10 /-4
-7z= -14 /:(-7)
z=2
Sprawdzenie:
-5z+4=2z-10
-5*2+4=2*2-10
-10+4=4-10
-6= -6
2x=12/2
x=6
b)9y-6y=7+11
3y=18/3
y=6
c) -5z-2z=-10-4
-7z=-14/-7
z=2