$\text{a)}3x+7\le 34\mid -7$

$3x\le 27\mid :3$

$x\le 9$

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$\text{b)}\frac{3}{4}x-1>\frac{1}{3}\mid +1$

$\frac{3}{4}x>1\frac{1}{3}$

$\frac{3}{4}x>\frac{4}{3}\mid \cdot \frac{4}{3}$

$x>\frac{16}{9}$

$x>1\frac{7}{9}$

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  $\text{c)}0,1x+1<-0,5\mid \cdot 10$  

$1x+10<-5\mid -10$

$x<-15$   

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$\text{d)}5x-7\ge 3x+5\mid +7$

$5x\ge 3x+12\mid -3x$

$2x\ge 12\mid :2$

$x\ge 6$