1) - 7x + 18 + 9x +4x - 3 = 0
6x + 15 = 0
x = - 2.5
2) -x + 28 - 4x + 7x - 5 = 0
2x + 23 = 0
x = - 11,5
3) x - 3 + 21 x - 2x - 2 = 0
20x - 5 = 0
x = 0,25
4) -9x - 36 + 9x - 3x - 3 = 0
-3x - 39 = 0
x = -13
5) 5x - 30 - 12x - x + 2 = 0
-8x - 28 = 0
x = 3,5
6) 9x + 2 + 2x - x + 5 = 0
10x = -7
x = -0,7
7) 6x + 56 - 72x + 2x + 8 = 0
-64x + 64 = 0
x = 1