Example 8: Solve 0.1 of Exercise 3.1 by the method of substitution – InterviewSolution

1.	Example 8: Solve 0.1 of Exercise 3.1 by the method of substitution
Answer» 42-7(y)=-42; -7y=-42-42; -7y=-84, y=-84/-7=12,; 42-7(y)=-42; 42-7(12)=-42; 42-84=-42

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