解方程5-(x-1)=3-3x 3-2(2x+1) =2（x-3) 4x-3(20-x)=6x-7(9-x)

Answer 1

5-(x-1)=3-3x
==> 5 - x + 1 = 3 - 3x
==> 2x = -3
==> x = -3/2

3-2(2x+1) =2（x-3)
==> 3 - 4x - 2 = 2x - 6
==> 6x = 7
==> x = 7/6

4x-3(20-x)=6x-7(9-x)
==> 4x - 60 + 3x = 6x - 63 + 7x
==> 7x - 60 = 13x - 63
==> 6x = 3
==> x = 1/2