Ответ:
2/5x +2/3x-7/15x=2 1/2
Приведём дроби к ноз 15:
2/5x*3 + 2/3x*5 - 7/15x = 2 1/2
6/15х + 10/15х - 7/15х = 5/2
9/15х = 5/2
3/5х = 5/2
х= 5/2 : 3/5 = 5/2 * 5/3
х = 25/6 = 4 1/6
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Ответ:
2/5x +2/3x-7/15x=2 1/2
Приведём дроби к ноз 15:
2/5x*3 + 2/3x*5 - 7/15x = 2 1/2
6/15х + 10/15х - 7/15х = 5/2
9/15х = 5/2
3/5х = 5/2
х= 5/2 : 3/5 = 5/2 * 5/3
х = 25/6 = 4 1/6