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a) [(3.a +19): 5-2] ×11 + 2 = 35

b) 5 •[a: 3570 (24 + 30:5)] - 23 = 27
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A) [(3a +19): 5-2] ×11 + 2 = 35

11(3a+19) /5 - 22+2=35

33a+209/5-22+2=35

33a+209/5-20=35

33a+209-100=175

33a+109=175

33a=175-109

33a= 66 /:2

a=2

B)5 •[a: 3570 (24 + 30:5)] - 23 = 27

5•(1/3570a • 30) - 23 = 27

5•(1/199a) - 23 =27

5• 1/199a - 23 =27

5a-2737=3213

5a=3213+2737

5a=5950 /:5

a=119

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