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Aplicamos propiedad distributiva:
(3x)(4x) + (3x)(-3)+ (-4)(4x)+ (-4)(-3) = (6x)(2x) + (6x)(-5) + (-4)(2x) + (-4)(-5)
12x² -9x - 16x + 12 = 12x² - 30x -8x +20
Se eliminan los "12x²"
-25x+12= -38x+20
38x - 25x = 20 -12
13x = 8
x=8/13
Ecuacion #2:
3x(x-3)+5(x+7)-x(x+1)-2(x^2+7)+4=0
Aplicamos propiedad distributiva:
3x(x) +3x(-3) + 5(x) + 5(7) + (-x)(x) +(-x)(1) +(-2)(x²) +(-2)(7) + 4 =0
3x² - 9x + 5x +35 - x² - x -2x² -14 +4 =0
(3x²-x²-2x²) + (-9x+5x-x) + (35-14+4) =0
0 + (-5x) + (25) =0
25 =5x
25/5=x
5=x
Eso es todo!!!!!!!
[6 - 3x + 2 ] - 1 = 4x
6 - 3x + 2 - 1 = 4x
7 - 3x = 4x
- 3x - 4x = - 7
- 7x = - 7
x = -7/-7
x = 1
Solución :
x = 1