exam Maths Puzzle Numerical Ability

Help with this one please.

Solve for x exactly

5^x+4 = 25^x+3

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exam Other Question

What is the capacity of a silo that is 30ft in height, the face against the barn is 10ft wide, and the barn is 5 ft. from the center of the circle? Solve the equation y = 3x+5/7x-4 for x. I have used the distributive property to get the equation to y*(7x-4) = 3x +5 and then y*(7x-4)-3x - 5 = 0 but from this point on I just ke