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1. 2y + 3xy = 510
2. 15x + 2y = 135
3. ( 2x + xy ) : ( y + 3x ) = 8 : 3
4. y + xy + 3x + x = 50
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(i) 2y + 3xy = 150
(ii) 5 (3x) + 2y = 135
(iii) [ 2x + xy ] : [ y + 2 ( 3x) ] = 8 : 3
(iv) y + xy + 3x + x = 150
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