Solve by cross multiplicate 3x+5y=21;-7x-6y=-49
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Step-by-step explanation:
3x+5y=21
-7x-6y=-49
3x+5y=21 × 6
-7x-6y=-49 ×5
18x+ 30y=126
- 35x -30y=-245
17x=119
x=7
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