( 12x - 5 )( 4x - 1 ) + ( 3x - 7 )( 1 - 16x ) = 81
( 12x.4x ) + ( 12x.1) + ( -5.4x) + ( -5).(-1) + 3x.1 + 3x. (-16x) + (-7).1 + ( -7 ).(-16x) = 81
\(48^2-12x-20x+5\)\(+3x-48x^2-7+112x\)\(=81\)
\(\left(-12x-20x\right)\)\(+\left(5-7\right)\)\(+\left(3x+112x\right)\)\(=81\)
\(-32x-2+115x^2\)\(=81\)
\(\left(-32x^2+115x^2\right)-2\)\(=81\)
\(83x-2\)\(=81\)
\(83x=81+2\)
\(83x=83\)
\(\Rightarrow x=1\)
( 12x - 5 )( 4x - 1 ) + ( 3x - 7 )( 1 - 16x ) = 81
<=> 48x2-32x+5 +3x-48x2-7+112x=81
<=> 83x= 81 +2
<=> 83x=83
<=> x=1
(12x - 5)(4x - 1) + (3x - 7)(1 - 16x) = 81
48x2 - 12x - 20x + 5 + 3x - 48x2 - 7 + 112x = 81
83x - 2 = 81
83x = 81 + 2
83x = 83
x = 1
