a)
[tex]\it 1,5x-6=0 \Rightarrow 1,5x=6\Big|_{\cdot2} \Rightarrow 3x=12\Big|_{:3} \Rightarrow x=4[/tex]
b)
[tex]\it 3,2x+16=0\Big|_{\cdot5} \Rightarrow 16x+16\cdot5=0\Big|_{:16} \Rightarrow x+5=0 \Rightarrow x=-5[/tex]
c)
[tex]\it 2,5x=-15\Big|_{\cdot2} \Rightarrow 5x=-30\Big|{:5} \Rightarrow x=-6[/tex]
d)
[tex]\it 0,7x=-21\Big|_{\cdot10} \Rightarrow 7x=-210\Big|_{:7} \Rightarrow x=-30[/tex]
