Simplify the following algebraic expressions.
-6x + 5 + 12x -6
2(x - 9) + 6(-x + 2) + 4x
3x2 + 12 + 9x - 20 + 6x2 - x
(x + 2)(x + 4) + (x + - 1)
1.2(x - 9) - 2.3(x + 4)
(x2y)(xy2)
(-x2y2)(xy2)

-6x + 5 + 12x - 6
-6x + 12 + 5 - 6
6x - 1

2(x - 9) + 6(-x + 2) + 4x
2(x) - 2(9) + 6(-x) + 6(2) + 4x
2x - 18 - 6x + 12 + 4x
2x - 6x + 4x - 18 + 12
-4x + 4x - 6
6

3x² + 12 + 9x - 20 + 6x² - x
3x² + 6x² + 9x - x + 12 - 20
9x² + 8x - 8

(x + 2)(x + 4) + (x + 5)(x - 1)
(x² + 4x + 2x + 8) + (x² - x + 5x - 5)
(x² + 6x + 8) + (x² + 4x - 5)
(x² + x²) + (6x + 4x) + (8 - 5)
2x² + 10 + 3

(x²y)(xy²)
(x²⁺¹y¹⁺²)
x³y³

(-x²y²)(xy²)
(-x²⁺¹y²⁺²)
-x³y⁴