解方程．4x+3×0.7=6.575

解方程．4x+3×0.7=6.575%+25%x=16x-0.3x-10=18．

①4x+3×0.7=6.5
        4x+2.1=6.5
    4x+2.1-2.1=6.5-2.1
            4x=4.4
         4x÷4=4.4÷4
             x=1.1

     ②75%+25%x=16
0.75-0.75+0.25x=16-0.75
    0.25x÷0.25=15.25÷0.25
              x=61

③x-0.3x-10=18
 0.7x+10-10=18+10
       0.7x=28
  0.7x÷0.7=28÷0.7
          x=40

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