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r=a2-a1
a2+2r=a4
12x+2(10x-1)=14x+4
12x+20x-2=14x+4
32x-14x=4+2
18x=6 /:18
x=1/3
12x=a2 = a1+r=2x+1+r
r=10x-1
a4=14x+4= a1+3r=2x+1+3(10x-1)=2x+1+30x-3
Przekształcamy równanie;
14x+4=2x+1+30x-3
-18x=-6 /(-18)
x=6\18=1\3