1.

Solve the simple equation and check the results : 18 – 7n = – 3

Answer»

Given 18 – 7n = – 3 

⇒ 18 – 7n – 18 = – 3 – 18 (Subtract 18 on both sides) 

⇒ – 7n = – 21

⇒ -7n/-7n = -21/-7 (Divide by – 7 on both sides)

⇒ n = 3

Check: 

Substitute n = 3 in 18 – 7n = – 3 

LHS = 18 – 7n 

= 18 – 7(3) 

= 18 – 21 

= – 3 = RHS 

Hence verified.



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