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4. Let x be the current price of the S6-mobile phone.
According to the given information, in three years the price will be P40,000.00 and will be six more than twice its current price.
Therefore, the equation can be expressed as:
2x + 6 = P40,000.00
5. Let M represent Mavic's age, Romar's age is 2M, and Jaypee's age is 2M + 2.
To show that twice the sum of Romar and Mavic ages is equal to Jaypee's age, the algebraic equation is:
2(2M + M) = 2M + 2