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16x=32-1
16x=31
x=31/16
B)27x+1=9x
27x-9x=-1
18x=-1
x=-1/18
c) log2(x+4)=1
2¹=x+4
2=x+4
x=2-4
x=-2
d)3²=2x-3
9= 2x -3
2x=9+3
x=12/2
x=6