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2014-10-22T18:42:47+03:00
X-24+5a-10b=69
x-24+5(a-2b)=69
x-24+5*7=69
x-24+35=69
x-24=69-35
x-24=34
x=34+24
x=58
1 5 1
2014-10-22T18:43:40+03:00
A-2b=7
x-24+5(a-2b)=69
x-24+5*7=69
x-24+35=69
x+11=69
     x=58