Tìm x biết:

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Bài 4: Tìm x biết:
a, x²-9=0.
a, 4x²-4=0.1
a, 4x²-36 0.
a, (5x-4)²-49x2=0.
a. (3x-5)-(x+1)=0.
a, (2x+1)-(x-1)=0.
a, (3x-1)-(x+5)=0.
a, (2x-3)-(x+5)=0.
a, (3x-4)-(x+2)=0.
a, x(x+1)-x²+1=0.
a, 4x.(x-2)-6+3x=0.
a, x(x+2)-3(x+2)=0.
a, 8x.(x-5)-2x+10=0.
a, x(2x-3)-2(3-2x)=0.
b, (x-1)+x(4-x)=11.
b, (x-5)-x.(x+2)=5.
b, x(x+4)-x-6x=10.
b, 2(x+3)-x-3x=0.
b, 3x(x-5)-x+25=0.
b, 3x (2x-1)-24x+12=0.
b, x(x-2019)-x+2019=0.
b, 3x (x-2019)-x+2019-0.
b, (x+2)-(x-2).(x+2)=0.
b, (x+3)-(x+2).(x-2)=4x+17.
b. (2x+1)-(4x-1).(x-3)-15=0.
b, (2x+3).(x-1)+(2x-3).(1-x)=0.
b. 2(5x-8)-3(4x-5)=4(3x-4)+11.
b. (3x-1).(2x-7)-(1-3x).(6x-5)=0.