Решите пожалуйста 3, 6, 7, 8

Question

Решите пожалуйста 3, 6, 7, 8

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Answer 1

3) 10/3-21/20х=29/15
200-63х=116
-63х=116-200
-63х=-84
х=4/3=1 1/3
6) 7/3:(х-7/6)=14/9
7/3:(6х-7)/6=14/9
7/3*6/(6х-7)=14/9
7*2/(6х-7)=14/9
14/(6х-7)=14/9
6х-7=9
6х=9+7
6х=16
х=8/3=2 2/3
7) 27:(220/7-39/14х)=9/8
27:(440-39х)/14=9/8
27*14/(440-39х)/14=9/8
378/(440-39х)=9/8
3024=9(440-39х)
336=440-39х
39х=440-336
39х=104
х=8/3 = 2 2/3
8) 48:(19/5х-25)=3/2
48:(19х-125)/5=3/2
48*5/(19х-125)=3/2
240/(19х-125)=3/2
480=3(19х-125)
160=19х-125
-19х=-125-160
-19х=-285
х=15