Question

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Answer 1

3 x a = 91- 79 + 5 x 3
3 x a = 12 +15
3 x a = 27 
a = 27: 3
a= 9
.....
5 x a =75 - 45 +5 x 4
5 x a = 30 + 20
5 x a = 50
a = 50 :5 
a = 10