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2x+8-3\left(x+1\right)^{2}=x\left(6-3x\right)
Use the distributive property to multiply 2 by x+4.
2x+8-3\left(x^{2}+2x+1\right)=x\left(6-3x\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+1\right)^{2}.
2x+8-3x^{2}-6x-3=x\left(6-3x\right)
Use the distributive property to multiply -3 by x^{2}+2x+1.
-4x+8-3x^{2}-3=x\left(6-3x\right)
Combine 2x and -6x to get -4x.
-4x+5-3x^{2}=x\left(6-3x\right)
Subtract 3 from 8 to get 5.
-4x+5-3x^{2}=6x-3x^{2}
Use the distributive property to multiply x by 6-3x.
-4x+5-3x^{2}-6x=-3x^{2}
Subtract 6x from both sides.
-10x+5-3x^{2}=-3x^{2}
Combine -4x and -6x to get -10x.
-10x+5-3x^{2}+3x^{2}=0
Add 3x^{2} to both sides.
-10x+5=0
Combine -3x^{2} and 3x^{2} to get 0.
-10x=-5
Subtract 5 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-5}{-10}
Divide both sides by -10.
x=\frac{1}{2}
Reduce the fraction \frac{-5}{-10} to lowest terms by extracting and canceling out -5.