[tex]\displaystyle 1)3(0,4x+7)-4(0,8x-3)=2\\1,2x+21-3,2x+12=2\\-2x+33=2\\-2x=2-33\\-2x=-31\\\\x=\frac{31}{2}=15\frac{1}{2}=15,5\\\\2)2x+5=2(x+1)+11\\2x+5=2x+2+11\\5=2+11\\5=13\\\oslash\\\\3)15(n+2)-30=15n\\15n+30-30=15n\\0=0\\n \in R[/tex]
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[tex]\displaystyle 1)3(0,4x+7)-4(0,8x-3)=2\\1,2x+21-3,2x+12=2\\-2x+33=2\\-2x=2-33\\-2x=-31\\\\x=\frac{31}{2}=15\frac{1}{2}=15,5\\\\2)2x+5=2(x+1)+11\\2x+5=2x+2+11\\5=2+11\\5=13\\\oslash\\\\3)15(n+2)-30=15n\\15n+30-30=15n\\0=0\\n \in R[/tex]