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2014-10-26T15:24:19+02:00
A+2b=60
b+3d+2c=80

3a+11b+15d+10c+120=3a+6b+5b+15d+10c+120=3(a+2b)+5(b+3d+2c)+120=3x60+5x80+120=180+400+120=580+120=700