Question

125-5 ( x - 1 ) = 25
12.( x - 1 ) : 3 = 4^3 + 2^3
( x - 1 )^3 = 125
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Answer 1

 

5(x-1)=125-25

5(x-1)=100

x-1=100:5

x-1=20

x=20+1

x=21

12(x-1):3=64+8

12(x-1):3=72

12(x-1)=72.3

12(x-1)=216

x-1=216:12

x-1=18

x=18+1

x=19

(x-1)^3=5^3

=>x-1=5

x=5+1

x=6