64 △ 2x = 20 to solve the equation

64 △ 2x = 20 to solve the equation

The solution is 0.64 = 20 × 2x
0.64=40x
x=0.64÷40
x=0.016
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Solving inequality 0.5 X-1 + 0.75 2x + 1 ≥ 18 (necessary process)
It's how many times on both sides at the same time,

(x-1)/0.5+(2x+1)/0.75>=18
Multiply both sides by three-thirds at the same time
3(x-1)+2(2x+1)>=27
Multiply the left by the left
3x-3+4x+2>=27
Well organized
7x>=28
Divide both sides by seven at the same time
x>=4

3^1-x×27^2x-4/9^-x=81^6,x=

3^(1-x)×3^(6x-12)÷3^(-2x)=3^24
3^[(1-x)+(6x-12)-(-2x)]=3^24
3^(7x-11)=3^24
7x-11=24
x=5