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求未知数x. 3.2×2.5-75%x=212÷(0.5x+1)=4(x-1):37

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求未知数x.
3.2×2.5-75%x=212÷(0.5x+1)=4
(x-1):
3
7
求未知数x. 3.2×2.5-75%x=212÷(0.5x+1)=4(x-1):37
(1)3.2×2.5-75%x=2
               8-0.75x=2
         8-0.75x+0.75x=2+0.75x
                   8-2=2+0.75x-2
               6÷0.75=0.75x÷0.75
                     x=8
(2)12÷(0.5x+1)=4
12÷(0.5x+1)×(0.5x+1)=4×(0.5x+1)
                    12÷4=4×(0.5x+1)÷4
                 0.5x+1-1=3-1
                0.5x÷0.5=2÷0.5
                        x=4
(3)(x-1):
3
7=0.1:
3
7
            x-1=0.1
          x-1+1=0.1+1
              x=1.1
(4)4x-24=2x+20
4x-24-2x+24=2x+20-2x+24
         2x=44
      2x÷2=44÷2
          x=22