Science / Find the 'x'

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Can you name the values of 'x'?

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EquationZeros
8^(x+1) = 32
x^2 + 7x + 12
log x + log x ^2 = 12
x^3 + x - 12
7^(2x) = 2401
6x^3 + 18x^2 - 24x
log8 + log3 = log2^x
4x^3 + x^2 - 8x -5
729^(2x) = 6561
log4-log2 = log5^x

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