You solve ___x 3 by adding the number you are multiplying 3 times!
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3^6 = 729
5x+3 = x+4 5x-x = 4-3 4x = 1 x = 1/4 Thats not even close to how you solve it. First of all the equation is written 5^(x+3)=x+4. Simple Logarithms are needed to solve.
3X=9 x=9/3 x=3
2x + 3= 9.X=
x = -3