-1=log(2x+3)

⚑ Flag

You appear to be using log base 10 so take the antilog of both sides. 10^(-1) = 0.1 antilog[log(2x+3)] = 2x+3 Now 0.1 = 2x +3.   Solving for x gets you -2.9/2 = -1.45 = x