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2014-11-15T19:33:55+02:00
X + x- 4 grade si 12 minute = 90 grade | - 4 grade si 12 minute
2x = 85 grade 48 minute | :2
x = 42 grade 54 minute
2 4 2
2014-11-15T19:35:02+02:00
A+b=90 de grade
a=b-4 grade si 12 minute 
si introduci in formula generala a+b=90 de grade