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2014-06-30T17:26:24+03:00
B-5=0.25*a
b=0.25a+5

a-10=0.25*b
a-10=0.25 (0.25a+5)
a-10=
0.0625a+1.25
a-0.0625a=1.25+10
0.9375a=11.25
a=11.25:0.9375
a=12

b=0.25*12+5
b=3+5
b=8