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7.
3^(x - 1) = 9 = 3^2
When bases are same powers should be equated
x - 1 = 2
x = 3
4^(y + 2) = 64 = 4^3
y + 2 = 3
y = 1
3^(x - 1) = 9 = 3^2
When bases are same powers should be equated
x - 1 = 2
x = 3
4^(y + 2) = 64 = 4^3
y + 2 = 3
y = 1
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