A family buys 2 adult metro tickets and 3 child tickets for AED 65  - 2x + 3y = 65, They buy 1 adult ticket and 2 child tickets for AED 30 - x +2y = 30 , A shop sells pencils and notebooks. 3 pencils and 2 notebooks cost AED 14 - 3x + 2y =14, Arrange 2y +19 =2x in standard form ax +by =c  - 2x - 2y =19, Arrange 4 - y = x using the standard form of an equation  - x - y = 4,

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