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What is 4 x 6? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? The silica content of magma greatly affects its viscosity. Magma with a high silica content has a? In one mole of the compound iron(III) oxide,
what fraction of the total number of ions is
the oxygen ion? If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3?