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6x-12=3x+3a
6x-3x=3a+12
3x=3a+12 /:3
x=a+4
b)
5y-(-8c+y)=12ab
5y+8c-y=12ab
5y-y=12ab-8c
4y =12ab-8c /:4
y=3ab-2c
c)
-13z+2(5z-2a)=20a+5z+40
-13z+10z-4a=20a+5z+40
-3z-5z=-20a+4a+40
-8z=-16a+40 /(-8)
z=2a-5
d)
2y-ab=c
2y=c+ab /:2
y=c+ab/2
e)
b=-ay+dv
ay=dv-b / :a
y=dv-b/a
f)
ay-c=4ay-d
ay-4ay=-d+c
y(a-4a)=-d+c /:(z-4a)
y=-d+c/-3a
g)
3by-z-a=2by
3by-2by=z+a
by=z+a /:b
y= z+a/b
DAJ NAJ