The Total solution for NCERT class 6-12
Supposemy identity number is x.Step I: 7 + 50Step II: 7x + 50 + 40 = 300or 7x + 90 = 300Solving the equation, we have7x + 90 = 300⇒ 7x =300 – 90 (Transforming 90 to RHS)⇒ 7x =210⇒ 7x/7=210/7 (Dividingboth sides by 7)⇒ x = 30Thus, my identity is 30.