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a)
(2x+3):5=[(2-x):3]-x /*15
3*(2x+3)=5*(2-x)-15x
6x+9=10-5x-15x
6x+9=10-20x /+20x
26x+9=10 /-9
26x=1 /:26
x=1/26
b)
[(x+1):2]-[(x-1):3]=¼ /*12
6*(x+1)-4*(x-1)=3
6x+6-4x+4=3
2x+10=3 /-10
2x=-7 /:2
x=3,5
c)
[(4x+7):2]-[(5x-1):6]=x+5 /*6
3*(4x+7)-(5x-1)=6*(x+5)
12x+21-5x+1=6x+30
7x+22=6x+30 /-6x
x+22=30 /-22
x=8
d)
[(x+5):4]-[(2x+1):8]=½(2x-x) /*8
2(x+5)-(2x+1)=4x
2x+10-2x-1=4x
9=4x /:4
x=2,25