OPGAVEN
1. Los op:  2x - 4 = 5x + 7
2. Los op:  4 - (3x - 3) = 5x
3. Schrijf zonder haakjes:   -2(x + 3)(4 - 3x)

OPLOSSING
1.  2x - 4 = 5x + 7 Þ  -3x = 11  Þ  x = -11/3 = -32/3.
2. 4 - (3x - 3) = 5Þ   4 - 3x + 3 = 5x  Þ   7 = 8x  Þ   x = 7/8
3. -2(x + 3)(4 - 3x) = -2(4x - 3x2 + 12 - 9x) = -8x + 6x2 - 24 + 18x = 6x2 + 10x - 24