1.100x-(27-1/3x)x9= 179 2.100x+(27-1/3x)x9=179 3.6/7x+(42-1/
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100x-(27-1/3x)x9= 179

100x-243+3x=179

103x=422

x=422/103

2.100x+(27-1/3x)x9=179

100x+243-3x=179

97x=-64

x=-64/97

3.6/7x+(42-1/2x)x1/7=20

6/7x+6-1/14x=20

12/14x-1/14x=20-6

11/14x=14

x=196/11

4.6/7x-(42-1/2x)x1/4=20

6/7x-21/2+1/8x=20

48/56x+7/56x=20+21/2

55/56x=61/2

x=1708/55