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2014-10-22T19:58:00+03:00
3(x+1)+7=2(x+1)+12
3x+3+7=2x+2+12
3x+10=2x+14
3x-2x=14-10
x=4
2 5 2
2014-10-22T19:59:47+03:00
3(x+1)+7=2(x+1)+12 =
3x+3+7=2x+2+12=
3x+10=2x+14=
3x-2x=14-10=

x=4