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2010-01-19T17:24:07+01:00
(3x+2+3)-4=13
3x+5-4=13
3x+1=13
3x=12
x=4
2010-01-19T17:24:36+01:00
[(3x+2)+3]-4=13
(3x+2+3)-4=13
3x+5-4=13
3x=12
x=4
2010-01-19T17:26:12+01:00
[(3x+2)+3]-4=13
[(3x+2)+3] = 17
(3x+2)+3 = 17
(3x+2) = 14
3x + 2 = 14
3x = 12
x = 4