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x+2=3x+2
x=3x
0=2x
x=0
b)2x+2-8x=15-6x
-6x+2=15-6x
2=15 fałsz
c)6x-5=4x+3
2x-5=3
2x=8
x=4
d)5x-2=4x-8
x-2=-8
x= -6
e)
(x+1+2x)/2=(x+2)/2
3x+1=x+2
2x+1=2
2x=1
x=1/2
f) (x+1)/2 + 2x /2=(x+2)/3
(x+1+2x) /2= (x+2)/3 /*6
3(3x+1)= 2(x+2)
9x+3=2x+4
7x=1
x=1/7