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x + (3x - 3) = 6 - (8x + 12) Aplicamos la propiedad distributiva.
x + 3x -3 = 6 -8x -12 (Aplicamos supresión de paréntesis)
x + 3x = 6 - 8x - 12 + 3
4x = 6 - 8x - 12 + 3
4x +8x = 6 - 12 + 3
12x = -6 + 3
12 x = -3
x = -3 : 12
x = -3/12 => -0,25
Comprobamos:
x + 3. (x-1) = 6 - 4. (2x+3)
-0,25 + 3. (-0,25 - 1) = 6 - 4 . (2. -0,25 + 3)
-0,25+ 3. -1,25 = 6 - 4 . 2,5
-0,25 + -3,75 = 6 - 10
-4 = -4