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Express the following to Mathematical symbol.
1. Zab is x years old now. What is his age 7 years from now?
2. Joan is twice as old as her sister now. What is her age 6 years ago?
3. A square has a side 3x - 2 , what is the perimeter?
4. His income is 7x + 6 every day. What is his total income in x days?

Eto nalang pa answer​