7(x + 3) = 7x + 21
4(x + 2) = 4x + 8
3(8 + x) = 24 + 3x
4(x + 5) = 4x + 20
x(6 + x) = 6x + x²
5(3 + 2x) = 15 + 10x
5(4 - x) = 20 - 5x
2(7x + 9) = 14x + 18
5(x - 4) = 5x - 20
3(2 - x) = 6 - 3x
-4(-x + 5) = 4x - 20
7(3x - 1) = 21x - 7
-7(-3 + 2x) = 21 - 14x
x(x - 6) = x² - 6x
-5(-x - 4) = 5x + 20
-3(x + 5) = -3x - 15
-4(2 + x) = -8 - 4x
-x(5x - 3) = -5x² + 3x
5x(1 - 6x) = 5x - 30x²
-4(2x² - 3) = -8x² + 12
-x(1 - 4x) = -x + 4x²
-5x(2 - x) = -10x + 5x²
-x(3x + 1) = -3x² - x
-3x(2x + 3) = -6x² - 9x
-7x(3 - 5x) = -21x + 35x²
