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-3x+7 =2x-9
-3x-2x = -9-7
-5x= -16
x= -16/ -5
x = 16/5

(4x-1)(3x+6) =0

4x-1 =0                               3x+6 =0
4x =1                                       3x = -6
x = 1/4                                      x = -6/3 = -2


2x(x+4) =0

2x =0                                    x+4 =0
x =0 /2 = 0                                 x = -4

4x²-3 =21
4x²-3-21 =0
4x²-24 =0
4(x²-6) =0
4(x-V6)(x+V6) =0

x-V6 =0                         x+V6 =0
x = V6                            x = -V6