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2014-05-21T10:30:22+03:00
2r12-3r18+(-3r108+10r450)

r12=2r3
r18=3r2
r108=6r3
r450=15r2

2*2r3-3*3r2-3*6r3+10*15r2=
4r3-9r2-18r3+150r2=
-14r3+141r2

1 5 1
2014-05-21T10:59:35+03:00
2r12-3r18+(-3r108+10r450)

r12=2r3
r18=3r2
r108=6r3
r450=15r2

2*2r3-3*3r2-3*6r3+10*15r2=
4r3-9r2-18r3+150r2=
-14r3+141r2