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6x+9=(10-5x)-15x
6x+5x+15x=-9+10
26x=1/ :26
x=1/26
6x+9=10-5x-15x /+15x
21x+9=10-5x /+5x
26x+9=10 /-9
26x=1 /:26
x= 1/26
b)(x + 1)/2 - (x -1)/3 = 0,25
3x+3-2x-2=1.5
x-1=1.5 /+1
x=2.5
c)(4x+7)/2 - (5x - 1)/6 = x + 5
12x+21-5x-1=6x+30
7x+20=6x+30 /-6x
x+20=30 /-20
x=10