Question

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4)$\frac{1,4}{2x+1}= \frac{4,6}{23}$
5)$\frac{15}{27}= \frac{9}{8x+4,2}$
6)$\frac{5x-0,8}{16}= \frac{3,4}{17}$

Answer 1

2x+1=1.4*23/4.6
2x+1=7
2x=7-1
2x=6
x=6/2
x=3

8x+4.2=9*27/15
8x+4.2=16.2
8x=16.2-4.2
8x=12
x=12/8
x=1.5

5x-0.8=3.4*16/17
5x-0.8=3.2
5x=3.2+0.8
5x=4
x=4/5
x=0.8