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5x - 7 = 4(2)
5x = 8 + 7
x = 15/5 = 3
HP = {x | x = 3}
[1/81][√3^(5x+1)]=81
√3^[5x+1)]=81×81
=6561
3^(5x+1)=6561²
=3^8
5x+1=8
5x=8-1
=7
x=7÷5
=1.4#