b) ( x+ 2) ( 3x-2) - (3x-1) ( x-5) = 11
3x^2 +6x - 2x -4 - 3x^2 +x + 15x -5 =11
20x = 11 +4+5
20x = 20
x=1
c) 2(2x+ 1) ( 8x-3) + ( 3-4x) ( 8x-7) = 6x + 73
(4x + 2)(8x-3) + 24x - 32x^2 -3 +4x = 6x +73
32x^2 + 16x - 12x + 24x - 32x^2 +4x -6x = 73 +6 +3
26x = 82
x= 41/13
a. \(\left(x+2\right)\left(3x-2\right)-\left(3x-1\right)\left(x-5\right)=11\)
\(\Rightarrow3x^2-2x+6x-4-3x^2+15x+x-5=11\)
\(\Rightarrow20x-9=11\)
\(\Rightarrow x=1\)
Vậy..................
b. \(2\left(2x+1\right)\left(8x-3\right)+\left(3-4x\right)\left(8x-7\right)=6x+73\)
\(\Rightarrow\left(4x+2\right)\left(8x-3\right)+\left(3-4x\right)\left(8x-7\right)=6x+73\)
\(\Rightarrow32x^2-12x+16x-6+24x-21-32x^2+28x-6x=73\)
\(\Rightarrow50x-27=73\)
\(\Rightarrow x=100\)
Vậy..............
