解方程|4x+3|=2x+9

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解方程|4x+3|=2x+9
解方程|4x+3|=2x+9

解方程|4x+3|=2x+9
1.当4x+3是正数的时候,直接去掉绝对值,则:
4x +3 = 2x +9
2x =6
x =3
2.当4x+3是负数的时候,去掉绝对值后,在(4x+3)前面加负号,则:
-(4x+3)=2x +9
6x=-12
x=-2
则,x=3或者x=-2

4x +3 = 2x +9 或 4x+3 = -2x -9
2x =6 6x = -12
x =3 x =-2

2(x-2)+3(4x-2)=7(x+4) 2x-4+12x-6=7x+28 7x=38 x=38/7 2(x-2)+3(2x-1)=9(x-1) 2x-4+6x-3=9x-9 x=2 2

4x +3 = 2x +9 或 4x +3 = -2x -9
2x =6 6x = -12
x =3 x =-2