\(a,5-\left(x-6\right)=4\left(3-2x\right)\)
\(\Rightarrow5-x+6=12-8x\)
\(\Rightarrow-x+8x=12-5-6\)
\(\Rightarrow7x=1\)
\(\Rightarrow x=\dfrac{1}{7}\)
\(c,7-\left(2x+4\right)=- \left(x+4\right)\)
\(\Rightarrow7-2x-4+x+4=0\)
\(\Rightarrow-x=-7\)
\(\Rightarrow x=7\)
\(e,\left(x+1\right)\left(2x-3\right)=\left(2x-1\right)\left(x+5\right)\)
\(\Rightarrow2x^2-3x+2x-3=2x^2+10x-x-5\)
\(\Rightarrow2x^2-3x+2x-2x^2-10x+x=-5+3\)
\(\Rightarrow\) pt vô nghiệm
\(g,\left(x-1\right)-\left(2x-1\right)=9-x\)
\(\Rightarrow x-1-2x+1-9+1=0\)
\(\Rightarrow-x=8\)
\(\Rightarrow x=-8\)
a)
`5-(x-6)=4(3-2x)`
`<=>5-x+6=12-8x`
`<=>-x+8x=12-5-6`
`<=>7x=1`
`<=>x=1/7`
c)
`7-(2x+4)=-(x+4)`
`<=>7-2x-4=-x-4`
`<=>-2x+x=-4-7+4`
`<=>-x=-7`
`<=>x=7`
e)
`(x+1)(2x-3)=(2x-1)(x+5)`
`<=>2x^2-3x+2x-3=2x^2+10x-x-5`
`<=>2x^2-2x^2-3x+2x-10x+x=-5+3`
`<=>-10x=-2`
`<=>x=1/5`
g)
(x-1)-(2x-1)=9-x
`<=>x-1-2x+1=9-x`
`<=>x-2x+x=9+1-1`
`<=>-2x=9`
`<=>x=-9/2`
i)
x(x+3)^2-3x=(x+2)^3+1
`<=>x(x^2+6x+9)-3x=(x^3+6x^2+12x+8)+1
`<=>x^3+6x^2+9x-3x=x^3+6x^2+12x+8+1
`<=>x^3-x^3+6x^2-6x^2+9x-3x-12x=8+1`
`<=>-6x=9`
`<=>x=-3/2`
. Ta có:
