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2x+1+x+x+5 = 30
4x+6=30
4x=30-6
4x=24 / :4
x=24:4
x=6
c.
-4+4(2-5x)=-9
-4+8-20x=9
-20x=9+4-8
-20x=5 / :-20
x=5:(-20)
x= - 5/20
x= - 1/4
d.
iloczyn x i 4 -> x*4
x*4-20=8
4x=8+20
4x=28 /:4
x= 7
b.
5x-2(x+4)=10
5x-2x-8=10
3x=10+8
3x=18 / :3
x= 6