- Find all integer solutions x and y such that 6x + 21y = 9?

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Is it true that the oxidation number of an ion is equal to its protons subtracting its electrons? How can i determine crop coefficient of constructed wetland macrophytes? If 5sinθ = 3 determine the value of:
1. cos (θ-360)
2. Tan (squared)θ
3. Sin θ x cos θ (all divided by cos (squared θ)? What are the applications of poisons equation? A reaction produced 52.1 g of kcl how much o2 was produced in grams?