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2014-10-10T15:43:17+03:00
111+2x+29=1000
111+2x=1000-29
111+2x=971
2x=971-111
2x=860
x=860:2
x=430
2 5 2
2014-10-10T15:44:12+03:00
111+2x+29=1000
111+29+2x=1000
140+2x=1000
2x=1000-140
2x=860
x=860:2
x=430