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Explanation:
1) Ans X-7=19
2) Ans 7m+42=21
7m=21-42
7m=-21
7m= -21/7
m= -3
3) Ans 8(x-4)+2-42=42-42
8(x-4)-40=0
8x-32-40=0
8x-72=0
8x=72
x=72/8
x=9
4) Ans 5x-9=1
5x= 1+9 (Adding 9 on this side)
5x=10
x=10/5
x=2
5) Ans Trial and error method
3(x-1)=6
Put x=3
3(3-1)=6
3(2)=6
6=6
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