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2014-09-04T10:59:37+03:00
4•a +3•x + 4•b = 66
4a+4b+3x=66
4(a+b)+3x=66
4x6+3x=66
24+3x=66
3x=66-24
3x=42
x=14
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2014-09-04T11:02:26+03:00